Nelson Functions 11
Nelson Functions 11
1st Edition
Chris Kirkpatrick, Marian Small
ISBN: 9780176332037
Textbook solutions

All Solutions

Page 70: Check Your Understanding

Exercise 1
Solution 1
Solution 2
Step 1
1 of 1
A is the vertical stretch factor while C is the horizontal compression factor. B indicates which way the graph is flipped. D is the horizontal translation while E is the vertical translation factor.
Step 1
1 of 3
begin{table}[]
defarraystretch{1.5}%
begin{tabular}{|l|l|}
hline
Transformation & Description \ hline
$y=f(x)+c$ & begin{tabular}[c]{@{}l@{}}vertical translation of\ $c$ units upwardend{tabular} \ hline
$y=f(x+d)$ & begin{tabular}[c]{@{}l@{}}horizontal translation of $d$ units\ to the leftend{tabular} \ hline
$y=acdot f(x)$ & begin{tabular}[c]{@{}l@{}}vertical stretching by a factor of $a$end{tabular} \ hline
$y=f(kx)$ & begin{tabular}[c]{@{}l@{}}horizontal compression by $dfrac{1}{|k|}$end{tabular} \ hline
$y=-f(x)$ & begin{tabular}[c]{@{}l@{}}reflecting the function in\ the $x$-axisend{tabular} \ hline
$y=f(-x)$ & begin{tabular}[c]{@{}l@{}}reflecting the function in \ the $y$-axisend{tabular} \ hline
end{tabular}
end{table}
Step 2
2 of 3
A: vertical stretch by a factor of 5

B: reflection in $y$-axis

C: horizontal compression by a factor of $dfrac{1}{3}$

D: horizontal translation 2 units to the right

E: vertical translation 4 units up

Result
3 of 3
A: vertical stretch by a factor of 5

B: reflection in $y$-axis

C: horizontal compression by a factor of $dfrac{1}{3}$

D: horizontal translation 2 units to the right

E: vertical translation 4 units up

Exercise 2
Solution 1
Solution 2
Step 1
1 of 1
A is the vertical stretch factor while C is the horizontal compression factor. B indicates which way the graph is flipped. D is the horizontal translation while E is the vertical translation factor.

A-Multiplies the y-coordinates by 5

B-Multiplies the x-coordinates by -1

C-Divides the x-coordinates by 3

D-Add 2 to the x-coordinate

E=Add 4 to the y-coordinate

Step 1
1 of 3
begin{table}[]
defarraystretch{1.5}%
begin{tabular}{|l|l|}
hline
Transformation & Description \ hline
$y=f(x)+c$ & begin{tabular}[c]{@{}l@{}}vertical translation of\ $c$ units upwardend{tabular} \ hline
$y=f(x+d)$ & begin{tabular}[c]{@{}l@{}}horizontal translation of $d$ units\ to the leftend{tabular} \ hline
$y=acdot f(x)$ & begin{tabular}[c]{@{}l@{}}vertical stretching by a factor of $a$end{tabular} \ hline
$y=f(kx)$ & begin{tabular}[c]{@{}l@{}}horizontal compression by $dfrac{1}{|k|}$end{tabular} \ hline
$y=-f(x)$ & begin{tabular}[c]{@{}l@{}}reflecting the function in\ the $x$-axisend{tabular} \ hline
$y=f(-x)$ & begin{tabular}[c]{@{}l@{}}reflecting the function in \ the $y$-axisend{tabular} \ hline
end{tabular}
end{table}
Step 2
2 of 3
Divide the $x$-coordinates by 3 $implies$ horizontal compression by $dfrac{1}{3}implies$ C

Multiply the $y$-coordinates by 5 $implies$ vertical stretching by factor 5 $implies$ A

Multiply the $x$-coordinates by $-1implies$ reflecting in $y$-axis $implies$ B

Add $4$ to $y$-coordinate : E

Add 2 to $x$-coordinate : D

Result
3 of 3
Divide the $x$-coordinates by 3 : C

Multiply the $y$-coordinates by 5 : A

Multiply the $x$-coordinates by : B

Add $4$ to $y$-coordinate : E

Add 2 to $x$-coordinate : D

Exercise 3
Step 1
1 of 2
1) we need divide the x-coordinate of point (1,1) on $f(x)$ by 3 to compress the graph horizontally by the factor $dfrac{1}{3}$, so point is $(dfrac{1}{3},1)$

2) we need divide the x-coordinate of point (1,1) on $f(x)$ by 3 to compress the graph horizontally by the factor $dfrac{1}{3}$ and then reflect in the y-axis so point is $(-dfrac{1}{3},1)$

3) we need divide the x-coordinate of point (1,1) on $f(x)$ by 3 to compress the graph horizontally by the factor $dfrac{1}{3}$, reflect in the y-axis and vertical stretch by a factor of 5, so point is $(-dfrac{1}{3},5)$

4) The graph $f(x)$ is is translated 2 units right, compressed horizontally by the factor $dfrac{1}{3}$ and reflected in the y-axis, then
graph is stretched vertically by the factor 5, and finally translated 4 units up, so point is $(dfrac{5}{3},9)$

Exercise scan

Result
2 of 2
begin{table}[]
defarraystretch{3.2}%
begin{tabular}{|c|c|c|c|c|}
hline
$f(x)$ & $f(3x)$ & $f(-3x)$ & $5f(-3x)$ & $5f{[}-3(x-2){]}+4$ \ hline
$(1,1)$ & $left(dfrac{1}{3},1right)$ & $left(-dfrac{1}{3},1right)$ & $left(-dfrac{1}{3},5right)$ & $left(1dfrac{2}{3}, 9right)$ \ hline
end{tabular}
end{table}
Exercise 4
Step 1
1 of 7
a) From the graph of $y=f(x)$ the graph of $y=3f(x)-1$ is a vertical stretch by a factor of 3 and then is shifted down 1 unit.
Step 2
2 of 7
b) From the graph of $y=f(x)$ the graph of $y=f(x-2)+3$ is a is shifted right 2 units and then shifted up 3 unit.
Step 3
3 of 7
c) From the graph of $y=f(x)$ the graph of $y=f(2x)-5$ is a horizontaly compressed by a factor of $dfrac{1}{2}$ and then is shifted down 5 unit.
Step 4
4 of 7
d) From the graph of $y=f(x)$ the graph of $y=-f(dfrac{1}{2}x)-2$ is a horizontaly compressed by a factor of 2, then vertical reflected (in the x-axis), and finally is shifted down 2 unit.
Step 5
5 of 7
e) From the graph of $y=f(x)$ the graph of $y=dfrac{2}{3}f(x+3)+1$ is a is shifted left 3 units, then verticaly stretched by a factor of $dfrac{2}{3}$ and finally shifted up 1 unit.
Step 6
6 of 7
f) From the graph of $y=f(x)$ the graph of $y=4f(-x)-4$ is a horizontaly reflected (in the y-axis), then vertical stretch by a factor of 4 and then is shifted down 4 unit.
Result
7 of 7
a) vertical stretching by factor 3 then translation 1 unit down

b) translation 2 units to the right and 3 units up

c) horizontal compression by factor $dfrac{1}{2}$ then translation 5 units down

d) reflection in $x$-axis, horizontal stretch by factor 2 and translation 2 units down

e) vertical compression by factor $dfrac{2}{3}$, translation 3 units to the left and 1 unit up

f) vertical stretch by factor 4, reflection in $y$-axis and translation 4 units down

Exercise 5
Step 1
1 of 5
In each part different functions are painting with different colors(follow the colors)

a) see graph:Exercise scan

Step 2
2 of 5
b) see graph:Exercise scan
Step 3
3 of 5
c) see graph:Exercise scan
Step 4
4 of 5
d) see graph:Exercise scan
Result
5 of 5
The graphs have been plotted in the answers.
Exercise 6
Step 1
1 of 3
begin{table}[]
defarraystretch{1.5}%
begin{tabular}{|l|l|}
hline
Transformation & Description \ hline
$y=f(x)+c$ & begin{tabular}[c]{@{}l@{}}vertical translation of\ $c$ units upwardend{tabular} \ hline
$y=f(x+d)$ & begin{tabular}[c]{@{}l@{}}horizontal translation of $d$ units\ to the leftend{tabular} \ hline
$y=acdot f(x)$ & begin{tabular}[c]{@{}l@{}}vertical stretching by a factor of $a$end{tabular} \ hline
$y=f(kx)$ & begin{tabular}[c]{@{}l@{}}horizontal compression by $dfrac{1}{|k|}$end{tabular} \ hline
$y=-f(x)$ & begin{tabular}[c]{@{}l@{}}reflecting the function in\ the $x$-axisend{tabular} \ hline
$y=f(-x)$ & begin{tabular}[c]{@{}l@{}}reflecting the function in \ the $y$-axisend{tabular} \ hline
end{tabular}
end{table}
Step 2
2 of 3
a) horizontal stretching by $dfrac{1}{1/3}=3implies y=fleft(dfrac{1}{3}xright)$

translation 4 units to the left $implies y=fleft(dfrac{1}{3}(x+4)right)$

b) reflection in $y$-axis $implies y=f(-x)$

vertical stretching by factor 2 $implies y=2f(-x)$

translation 3 units to the right and 1 unit up $implies y=2f(-(x-3))+1$

c) horizontal compression by factor $dfrac{1}{2}implies y=f(2x)$

reflection in $x$-axis $implies y=-f(2x)$

vertical stretching by factor 3 $implies y=-3f(2x)$

translation 1 unit to the right and 3 units down $implies y=-3f(2(x-1))-3$

Result
3 of 3
a) horizontal stretching by factor 3

translation 4 units to the left

b) reflection in $y$-axis

vertical stretching by factor 2

translation 3 units to the right and 1 unit up

c) horizontal compression by factor $dfrac{1}{2}$

reflection in $x$-axis

vertical stretching by factor 3

translation 1 unit to the right and 3 units down

Exercise 7
Step 1
1 of 4
a) If $f(x)=x^{2}$, then $y=f(x-2)+3$ is equal $y=(x-2)^{2}+3$ $text{replace $x$ with $x-2$}$

$text{textcolor{#4257b2}{Domain}}$ of a function is the set of input values for which the function is defined

$text{textcolor{#4257b2}{The range}}$ is the resulting $y$-values we get after substituting all the possible $x$-values

We can identify the domain and range of functions is by using graphs. Because the domain refers to the set of possible input values, the domain of a graph consists of all the input values shown on the x-axis. The range is the set of possible output values, which are shown on the y-axis.

From the graph we can conclude that:

$text{textcolor{#4257b2}{Domain}}$ of the function is interval : $(-infty,+infty)$

$text{textcolor{#4257b2}{Range}}$ of the function is interval: $[3,+infty)$

Graph of the function $y=(x-2)^{2}+3$ is:

Exercise scan

Step 2
2 of 4
b) a) If $f(x)=x^{2}$, then

$$
begin{align*}
y&=-f(dfrac{1}{4}(x+1))+2 \
&=-(dfrac{1}{4}(x+1))^{2}+2 tag{text{replace $x$ with $dfrac{1}{4}(x+1)$}}\
&=-dfrac{1}{16}(x+1)^{2}+2 \
end{align*}
$$

From the graph we can conclude that:

$text{textcolor{#4257b2}{Domain}}$ of the function is interval : $(-infty,+infty)$

$text{textcolor{#4257b2}{Range}}$ of the function is interval: $[2,+infty)$

Exercise scan
Step 3
3 of 4
c) If $f(x)=x^{2}$, then

$$
begin{align*}
y&=0.5f(3(x-4))-1 \
&=0.5(3(x-4))^{2}-1 tag{text{replace $x$ with $3(x-4)$}}\
&=0.5cdot9(x-4)^{2}-1 \
&=4.5(x-4)^{2}-1\
&=dfrac{9}{2}(x-4)^{2}-1\
end{align*}
$$

From the graph we can conclude that:

$text{textcolor{#4257b2}{Domain}}$ of the function is interval : $(-infty,+infty)$

$text{textcolor{#4257b2}{Range}}$ of the function is interval: $[-1,+infty)$

Exercise scan
Result
4 of 4
a) Domain: $(-infty,+infty)$ , Range: $[3,+infty)$

b) Domain: $(-infty,+infty)$ , Range: $[2,+infty)$

c) Domain: $(-infty,+infty)$ , Range: $[-1,+infty)$

Exercise 8
Step 1
1 of 4
a) If $f(x)=sqrt{x}$, then $y=f(x-1)+4$ is equal $y=sqrt{x-1}+4$ $text{replace $x$ with $x-1$}$

$text{textcolor{#4257b2}{Domain}}$ of a function is the set of input values for which the function is defined

$text{textcolor{#4257b2}{The range}}$ is the resulting $y$-values we get after substituting all the possible $x$-values

We can identify the domain and range of functions is by using graphs. Because the domain refers to the set of possible input values, the domain of a graph consists of all the input values shown on the x-axis. The range is the set of possible output values, which are shown on the y-axis.

From the graph we can conclude that:

$text{textcolor{#4257b2}{Domain}}$ of the function is interval : $[1,+infty)$

$text{textcolor{#4257b2}{Range}}$ of the function is interval: $[4,+infty)$

see graph:Exercise scan
Step 2
2 of 4
b) a) If $f(x)=sqrt{x}$, then

$$
begin{align*}
y&=f(-dfrac{1}{2}(x+4))-3 \
&=sqrt{-dfrac{1}{2}(x+4)}-3 tag{text{replace $x$ with $-dfrac{1}{2}(x+4)$}}\
end{align*}
$$

From the graph we can conclude that:

$text{textcolor{#4257b2}{Domain}}$ of the function is interval : $(-infty,-4]$

$text{textcolor{#4257b2}{Range}}$ of the function is interval: $[-3,+infty)$

Exercise scan
Step 3
3 of 4
b) a) If $f(x)=sqrt{x}$, then

$$
begin{align*}
y&=-2f(-(x-2))+1 \
&=-2sqrt{-(x-2)}+1 tag{text{replace $x$ with $-(x-2)$}}\
end{align*}
$$

From the graph we can conclude that:

$text{textcolor{#4257b2}{Domain}}$ of the function is interval : $(-infty,2]$

$text{textcolor{#4257b2}{Range}}$ of the function is interval: $(-infty,1)$

Exercise scan
Result
4 of 4
a) Domain: $[1,+infty)$, Range:$[4,+infty)$

b) Domain: $(-infty,-4]$, Range:$[-3,+infty)$

c) Domain: $(-infty,2]$, Range:$(-infty,1)$

Exercise 9
Step 1
1 of 4
a) If $f(x)=|x|$, then $y=2f(x-3)$ is equal $y=2|x-3|$ $text{replace $x$ with $x-3$}$

$text{textcolor{#4257b2}{Domain}}$ of a function is the set of input values for which the function is defined

$text{textcolor{#4257b2}{The range}}$ is the resulting $y$-values we get after substituting all the possible $x$-values

We can identify the domain and range of functions is by using graphs. Because the domain refers to the set of possible input values, the domain of a graph consists of all the input values shown on the x-axis. The range is the set of possible output values, which are shown on the y-axis.

From the graph we can conclude that:

$text{textcolor{#4257b2}{Domain}}$ of the function is interval : $(-infty,+infty)$

$text{textcolor{#4257b2}{Range}}$ of the function is interval: $[0,+infty)$

Exercise scan
Step 2
2 of 4
b) a) If $f(x)=|x|$, then

$$
begin{align*}
y&=4f(2(x-1))-2 \
&=4|2(x-1)|-2 tag{text{replace $x$ with $2(x-1)$}}\
end{align*}
$$

From the graph we can conclude that:

$text{textcolor{#4257b2}{Domain}}$ of the function is interval : $(-infty,+infty)$

$text{textcolor{#4257b2}{Range}}$ of the function is interval: $[-2,+infty)$

Exercise scan
Step 3
3 of 4
c) a) If $f(x)=|x|$, then

$$
begin{align*}
y&=-dfrac{1}{2}f(3(x+2))+4 \
&=-dfrac{1}{2}|3(x+2)|+4 tag{text{replace $x$ with $3(x+2)$}}\
end{align*}
$$

From the graph we can conclude that:

$text{textcolor{#4257b2}{Domain}}$ of the function is interval : $(-infty,+infty)$

$text{textcolor{#4257b2}{Range}}$ of the function is interval: $(-infty,4]$

Exercise scan
Result
4 of 4
a) domain = ${ xinbold{R}}$ , range = ${ yinbold{R};|;ygeq 0}$

b) domain = ${ xinbold{R}}$ , range = ${ yinbold{R};|;ygeq -2}$

c) domain = ${ xinbold{R}}$ , range = ${ yinbold{R};|;ygeq 4}$

Exercise 10
Step 1
1 of 8
$f(x)=dfrac{1}{x}$ This is a given function
Step 2
2 of 8
a) $y=dfrac{1}{x-2}$

The graph of $f(x)$ will horizontally shift to the right 2 units

So, there are used translation right 2 units

Exercise scan
Step 3
3 of 8
b)$y=dfrac{1}{x}+2$

The graph of $f(x)$ will vertically shift upward by 2 units

So, there are used translation up 2 units

Exercise scan
Step 4
4 of 8
c) $y=0.5(dfrac{1}{x})$

The graph of $f(x)$ will compresses vertically by factor of 0.5.

So, there are used vertical compression, by factor of 0.5

Exercise scan
Step 5
5 of 8
d)$y=dfrac{2}{x}$

$y=2cdotdfrac{1}{x}$

The graph of $f(x)$ will stretches vertically by factor of 2.

So, there are used vertical stretch, by factor of 2

Exercise scan
Step 6
6 of 8
e) $y=dfrac{1}{2x}$

The graph of $f(x)$ will compresses horizontaly by factor of $dfrac{1}{2}=0.5$.

So, there are used horizontal compression, by factor of 0.5

Exercise scan
Step 7
7 of 8
f) $y=-dfrac{1}{x}$

The graph of $f(x)$ is reflected across the x-axis.

So, there is used reflection across the x-axis.

Exercise scan
Result
8 of 8
a) horizontal translation 2 units to the right

b) vertical translation 2 units upward

c) vertical compression by factor $dfrac{1}{2}$

d) vertical stretching by factor 2

e) horizontal compression by factor $dfrac{1}{2}$

f) reflection in $x$-axis

Exercise 11
Step 1
1 of 3
If $f(x)=x^{2}$, then

$$
begin{align*}
g(x)&=f(2x+6) \
&=(2x+6)^{2} tag{text{replace $x$ with $2x+6$}}\
end{align*}
$$

Step 2
2 of 3
Graph of the function $g(x)=f(2x+6)$ is:

Exercise scan

Result
3 of 3
The graphs have been plotted in the answers.
Exercise 12
Step 1
1 of 3
If $f(x)=sqrt{x}$, then

$$
begin{align*}
h(x)&=f(-3x-12) \
&=sqrt{-3x-12} tag{text{replace $x$ with $-3x-12$}}\
end{align*}
$$

Step 2
2 of 3
Graph of the function $h(x)=f(-3x-12)=sqrt{-3x-12}$ is:

Exercise scan

Result
3 of 3
The graphs have been plotted in the answers.
Exercise 13
Step 1
1 of 3
If $f(x)=|x|$, then

$$
begin{align*}
p(x)&=f(4x+8)\
&=|4x+8| tag{text{replace $x$ with $4x+8$}}\
end{align*}
$$

Step 2
2 of 3
Graph of the function $p(x)=f(4x+8)=|4x+8|$ is:

Exercise scan

Result
3 of 3
The graphs have been plotted in the answers.
Exercise 14
Step 1
1 of 2
We shall sketch the graph of $P_d=|P-120|$

Exercise scan

Result
2 of 2
The graph of $P_d=|P-120|$ has been plotted in the answers.
Exercise 15
Step 1
1 of 3
begin{table}[]
defarraystretch{1.5}%
begin{tabular}{|l|l|}
hline
Transformation & Description \ hline
$y=f(x)+c$ & begin{tabular}[c]{@{}l@{}}vertical translation of\ $c$ units upwardend{tabular} \ hline
$y=f(x+d)$ & begin{tabular}[c]{@{}l@{}}horizontal translation of $d$ units\ to the leftend{tabular} \ hline
$y=acdot f(x)$ & begin{tabular}[c]{@{}l@{}}vertical stretching by a factor of $a$end{tabular} \ hline
$y=f(kx)$ & begin{tabular}[c]{@{}l@{}}horizontal compression by $dfrac{1}{|k|}$end{tabular} \ hline
$y=-f(x)$ & begin{tabular}[c]{@{}l@{}}reflecting the function in\ the $x$-axisend{tabular} \ hline
$y=f(-x)$ & begin{tabular}[c]{@{}l@{}}reflecting the function in \ the $y$-axisend{tabular} \ hline
end{tabular}
end{table}
Step 2
2 of 3
We shall use $y=dfrac{1}{s}$ as base function.

$T(s)=dfrac{20}{s}implies$ vertical stretching by factor 20

$T(s)=dfrac{15}{s-3}implies$ vertical stretching by factor 15 then translation 3 units to the right

Exercise scan

Result
3 of 3
$T(s)=dfrac{20}{s}implies$ vertical stretching by factor 20

$T(s)=dfrac{15}{s-3}implies$ vertical stretching by factor 15 then translation 3 units to the right

Exercise 16
Step 1
1 of 3
The graph of $g(x)=sqrt{x}$ is reflected across the y-axiss $longrightarrow$ $g_{1}(x)=sqrt{-x}$

then, stretched vertically by the factor 3 $longrightarrow$ $g_{2}(x)=3sqrt{-x}$

then translated 5 units right $longrightarrow$ $g_{3}(x)=3sqrt{-(x-5)}$

then translated 2 units down $longrightarrow$ $g_{4}(x)=3sqrt{-(x-5)}-2$

Use these steps, we get new function $textcolor{#4257b2}{h(x)=3g(-(x-5))-2=3sqrt{-(x-5)}-2}$

Step 2
2 of 3
Exercise scan
Result
3 of 3
Function is: $h(x)=3sqrt{-(x-5)}-2$

See graph

Exercise 17
Step 1
1 of 2
The graph of $y=f(x)$ is reflected across the y-axiss $longrightarrow$ $y_{1}=f(-x)$

then, stretched vertically by the factor 3 $longrightarrow$ $y_{2}=3f(-x)$

then translated up 2 units $longrightarrow$ $y_{3}=3f(-x)+2$

then translated 1 units left $longrightarrow$ $y_{4}=3f(-(x+1))+2$

$text{Use these steps we get new function: $textcolor{#4257b2}{h(x)=3f(-(x+1))+2}$}$

Result
2 of 2
$$
text{Equation of the new function is: $h(x)=3f(-(x+1))+2$}
$$
Exercise 18
Step 1
1 of 9
a) Equation of the given function is $y=dfrac{3}{-(x-2)}+1$

Parent function of this given function is $y=dfrac{1}{x}$

The graph of a function may be transformed using:

horizontal shift which shifts the graph 2 units to the right and verticaly shift 1 unit up, vertical stretch of 3, reflection in the x-axis.

Use these steps we get given function $y=dfrac{3}{-(x-2)}+1$, it corresponds to $text{textcolor{#4257b2}{Graph C}}$

Step 2
2 of 9
b) equation of the given function is $y=2|x-3|-2$

Parent function of this given function is $y=|x|$.

The graph of $y=2|x-3|-2$ is stretched vertically by the factor 2, and then translated 2 units down units and 3 unit right.

Using these transformation we get function $y=2|x-3|-2$, it corresponds to $text{textcolor{#4257b2}{Graph E}}$.

Step 3
3 of 9
c)Equation of the given fuunction is $y=-2sqrt{x+3}-2$

Parent function of this given function is $y=sqrt{x}$.

The graph of $y=sqrt{x}$ is reflected across the y-axis, stretched vertically by the factor 2, and then translated 3 units left and 2 units down

It corresponds to $text{textcolor{#4257b2}{graph A}}$.

Step 4
4 of 9
d) $y=(0.25(x-2))^{2}-3$ This is a given function

Parent function of this given function is $y=x^{2}$

The graph of $y=x^{2}$ is translated down 3 units and 2 units right.

It corresponds to $text{textcolor{#4257b2}{graph G}}$

Step 5
5 of 9
e) Equation of the given function is $y=-dfrac{4}{x}-3$

Parent function of this function is $y=dfrac{1}{x}$

The graph of $y=dfrac{1}{x}$ is reflected in one of the axes and translated 3 units down.

It corresponds to $text{textcolor{#4257b2}{graph F}}$.

Step 6
6 of 9
f) $y=-0.5|x+4|+2$ this is a given function

Parent function of this function is $y=|x|$

The graph of $y=|x|$ is reflected acros the y-axis, translated 4 units left and 2 units down.

It corresponds to $text{textcolor{#4257b2}{Graph D}}$

Step 7
7 of 9
g) $y=-0.5sqrt{1-x}+1$ this is a given function

Parent function of this function is $y=sqrt{x}$

The graph of $y=sqrt{x}$ is reflected across x-axis and y-axis, stretched vertically by the factor 0.5, translated 1 unit right and 1 unit up.

It corresponds to $text{textcolor{#4257b2}{Graph H}}$

Step 8
8 of 9
h) $y=-dfrac{1}{2}(x+4)^{2}+1$ this is a given function

$text{Parent function of this function is $y=x^{2}$}$

The graph of $y=x^{2}$ is reflected in the y-axis, stretched vertically by the factor $dfrac{1}{2}$ ,and then translated 4 units left and 1 unit up.

It corresponds to $text{textcolor{#4257b2}{Graph B}}$

Result
9 of 9
a) $longrightarrow$ Graph C

b) $longrightarrow$ Graph E

c) $longrightarrow$ Graph A

d) $longrightarrow$ Graph G

e) $longrightarrow$ Graph F

f) $longrightarrow$ Graph D

g) $longrightarrow$ Graph H

h) $longrightarrow$ Graph B

Exercise 19
Step 1
1 of 4
a) The function $f(x)=sqrt{x}$ has been transformed to $y=af[k(x-d)]+c$

We need determine $a, k, c$ and $d$.

The graph of $f(x)=sqrt{x}$ is stretched vertically by the factor 2 $longrightarrow$ $y=2sqrt{x}$

then translated 4 units right $longrightarrow$ $y=2sqrt{x-4}$

and then reflected in the x-axis $longrightarrow$ $y=-2sqrt{x-4}$

Use these steps, we get new function $textcolor{#4257b2}{y=-2g(x-4)=-2sqrt{x-4}}$

If we compare this function with $y=af[k(x-d)]+c$, we can conclude that:

$a=-2, k=1, c=0, d=4$

We can identify the domain and range of functions is by using graphs. Because the domain refers to the set of possible input values, the domain of a graph consists of all the input values shown on the x-axis. The range is the set of possible output values, which are shown on the y-axis.

From the graph we can conclude that:

$text{textcolor{#4257b2}{Domain}}$ of the function is interval : $[4,+infty)$

$text{textcolor{#4257b2}{Range}}$ of the function is interval: $(-infty,0)$

see graph:Exercise scan
Step 2
2 of 4
b) The function $f(x)=dfrac{1}{x}$ has been transformed to $y=af[k(x-d)]+c$

We need determine $a, k, c$ and $d$.

The graph of $f(x)=dfrac{1}{x}$ is compressed vertically by the factor 2 $longrightarrow$ $y=dfrac{1}{2x}$

then reflecred in the y-axis $longrightarrow$ $y=dfrac{1}{2}(dfrac{1}{-x})$

then translated 3 units left $longrightarrow$ $y=dfrac{1}{2}(dfrac{1}{-(x+3)})$

and thentranslated 4 units down $longrightarrow$ $y=dfrac{1}{2}(dfrac{1}{-(x+3)})-4$

Use these steps, we get new function $y=dfrac{1}{2}f(-(x+3))-4$

If we compare this function with $y=af[k(x-d)]+c$, we can conclude that:

$a=dfrac{1}{2}, k=-1, c=-4, d=-3$

We can identify the domain and range of functions is by using graphs. Because the domain refers to the set of possible input values, the domain of a graph consists of all the input values shown on the x-axis. The range is the set of possible output values, which are shown on the y-axis.

From the graph we can conclude that:

$text{textcolor{#4257b2}{Domain}}$ of the function is interval $left{xin R|xne-3 right}$:

$text{textcolor{#4257b2}{Range}}$ of the function is interval:$left{yin R|yne-4 right}$

Exercise scan
Step 3
3 of 4
c) The function $f(x)=|x|$ has been transformed to $y=af[k(x-d)]+c$

We need determine $a, k, c$ and $d$.

The graph of $f(x)=|x|$ is compressed horizontaly by the factor $dfrac{1}{3}$ $longrightarrow$ $y=dfrac{1}{3}|x|$

then, verticaly streched by the factor 3 $longrightarrow$ $y=3(dfrac{1}{3}|x|)$

then translated 1 units right $longrightarrow$ $y=3(dfrac{1}{3}|x-1|)$

and then translated 6 units down $longrightarrow$ $y=3(dfrac{1}{3}|x-1|)-6$

Use these steps, we get new function $y=3f(dfrac{1}{3}|x-1|)-6$

If we compare this function with $y=af[k(x-d)]+c$, we can conclude that:

$a=3, k=dfrac{1}{3}, c=-6, d=1$

We can identify the domain and range of functions is by using graphs. Because the domain refers to the set of possible input values, the domain of a graph consists of all the input values shown on the x-axis. The range is the set of possible output values, which are shown on the y-axis.

From the graph we can conclude that:

$text{textcolor{#4257b2}{Domain}}$ of the function is interval : $(-infty,+infty)$

$text{textcolor{#4257b2}{Range}}$ of the function is interval: $[-6,+infty)$

Exercise scan
Result
4 of 4
begin{table}[]
defarraystretch{1.8}%
begin{tabular}{|l|l|}
hline
a) & begin{tabular}[c]{@{}l@{}}$a=-2$, $k=1$, $c=0$, $d=4$\ domain = ${ xinbold{R};|;xgeq 4}$\ range = ${ yinbold{R};|;yleq 0}$end{tabular} \ hline
b) & begin{tabular}[c]{@{}l@{}}$a=dfrac{1}{2}$ , $k=-1$, $c=-3$, $d=-4$\ domain = ${ xinbold{R};|;xneq -3}$\ range = ${ yinbold{R};|;yneq -4}$end{tabular} \ hline
c) & begin{tabular}[c]{@{}l@{}}$a=3$ , $k=dfrac{1}{3}$ , $c=-6$, $d=1$\ domain = ${ xinbold{R}}$\ range = ${ yinbold{R};|;ygeq -6}$end{tabular} \ hline
end{tabular}
end{table}
Exercise 20
Step 1
1 of 6
The graphical , x-intercepts are where the graph crosses the x-axis.

Algebraic, an x-intercept is a point on the graph where y is zero,

$text{If $f(x)=(x-2)(x+5)$, we need determine x-intercepts}$.

Step 2
2 of 6
a) $y=f(x)=(x-2)(x+5)$

Using the definitions of the intercepts, we will proceed as follows:

$text{$y = 0$ for the x-intercepts, so}$

$$
begin{align*}
y&=0\
(x-2)&(x+5)=0\
x-2=0 &lor x+5=0\
x=2 &lor x=-5\
end{align*}
$$

$text{Then the x-intercepts are the points $(2,0)$ and $(-5,0)$}$

Exercise scan
Step 3
3 of 6
b) $text{There is $y=-4f(x)=-4(x-2)(x+5)$}$

$text{$y = 0$ for the x-intercepts, so}$

$$
begin{align*}
y&=0\
-4(x-2)&(x+5)=0\
x-2=0 &lor x+5=0\
x=2 &lor x=-5\
end{align*}
$$

$text{Then the x-intercepts are the points $(2,0)$ and $(-5,0)$}$

We can conclude that: the x-intercepts are the same as in part a)

Exercise scan
Step 4
4 of 6
c) $text{The first, we need determine new function $f(-dfrac{1}{3}x)$:}$

$y=f(-dfrac{1}{3}x)=(-dfrac{1}{3}x-2)(-dfrac{1}{3}x+5)$ ($text{replace $x$ with $-dfrac{1}{3}x$}$)

$text{$y = 0$ for the x-intercepts, so}$

$$
begin{align*}
y&=0\
(-dfrac{1}{3}x-2)&(-dfrac{1}{3}x+5)=0\
-dfrac{1}{3}-2=0 &lor -dfrac{1}{3}x+5=0\
-dfrac{1}{3}x=2 &lor -dfrac{1}{3}x=-5 tag{text{multiply both sides of equation by -3}}\
x=-6 & lor x=15\
end{align*}
$$

$text{Then the x-intercepts are the points $(-6,0)$ and $(15,0)$}$

Exercise scan
Step 5
5 of 6
d) $text{The first, we need determine new function $f(-(x+2))$:}$

$$
begin{align*}\
y&=f(-(x+2))\
&=(-(x+2)-2)(-(x+2)+5)\
&=(-x-2-2)(-x-2+5)\
&=(-x-4)(-x+3) (text{replace $x$ with $-(x+2)$})\
end{align*}
$$

$text{$y = 0$ for the x-intercepts, so}$

$$
begin{align*}
y&=0\
(-x-4)&(-x+3)=0\
-x-4=0 &lor -x+3=0\
-x=4 &lor -x=-3 tag{text{multiply both sides of equation by -1}}\
x=-4 & lor x=3\
end{align*}
$$

$text{Then the x-intercepts are the points $(-4,0)$ and $(3,0)$}$

Exercise scan
Result
6 of 6
a) $(2,0)$ and $(-5,0)$

b) $(2,0)$ and $(-5,0)$

c) $(-6,0)$ and $(10,0)$

a) $(-4,0)$ and $(3,0)$

Exercise 21
Step 1
1 of 3
begin{table}[]
defarraystretch{1.5}%
begin{tabular}{|l|l|}
hline
Transformation & Description \ hline
$y=f(x)+c$ & begin{tabular}[c]{@{}l@{}}vertical translation of\ $c$ units upwardend{tabular} \ hline
$y=f(x+d)$ & begin{tabular}[c]{@{}l@{}}horizontal translation of $d$ units\ to the leftend{tabular} \ hline
$y=acdot f(x)$ & begin{tabular}[c]{@{}l@{}}vertical stretching by a factor of $a$end{tabular} \ hline
$y=f(kx)$ & begin{tabular}[c]{@{}l@{}}horizontal compression by $dfrac{1}{|k|}$end{tabular} \ hline
$y=-f(x)$ & begin{tabular}[c]{@{}l@{}}reflecting the function in\ the $x$-axisend{tabular} \ hline
$y=f(-x)$ & begin{tabular}[c]{@{}l@{}}reflecting the function in \ the $y$-axisend{tabular} \ hline
end{tabular}
end{table}
Step 2
2 of 3
To transform $y=f(x)$ to $y=acdot f(k(x-d))$, perform the following transformations.

(1) horizontally compress by a factor of $dfrac{1}{|k|}implies y=f(kx)$

if $k<0$, also reflect in the $y$-axis

(2) vertically stretch by a factor of $aimplies y=acdot f(kx)$

if $a<0$, also reflect in the $x$-axis

(3) horizontally translate $d$ units to the right $implies y=acdot f(k(x-d))$

if $d<0$, translate to the left

(4) vertically translate $c$ units up $implies y=acdot f(k(x-d))+c$

if $c<0$, translate downwards

Result
3 of 3
(1) horizontally compress by a factor of $dfrac{1}{|k|}implies y=f(kx)$

if $k<0$, also reflect in the $y$-axis

(2) vertically stretch by a factor of $aimplies y=acdot f(kx)$

if $a<0$, also reflect in the $x$-axis

(3) horizontally translate $d$ units to the right $implies y=acdot f(k(x-d))$

if $d<0$, translate to the left

(4) vertically translate $c$ units up $implies y=acdot f(k(x-d))+c$

if $c<0$, translate downwards

Exercise 22
Step 1
1 of 4
a)$text{ The graph of $f(x)=x^{2}$ is reflected across the x-axis $longrightarrow$ $y=-x^{2}$}$

$text{then, scompressed vertically by the factor $dfrac{1}{4}$ $longrightarrow$ $y=-dfrac{1}{4}x^{2}$}$

$text{then translated 6 units left $longrightarrow$ $y=-dfrac{1}{4}(x+6)^{2}$}$

$text{then translated 2 units up $longrightarrow$ $y=-dfrac{1}{4}(x+6)^{2}+2$}$

$$
text{Use these steps, we get new function $textcolor{#4257b2}{y=-dfrac{1}{4}(x+6)^{2}+2}$}
$$

Step 2
2 of 4
b) $text{Using part a) , we can conclude, equation of the function is $y=-dfrac{1}{4}(x+6)^{2}+2$}$
Step 3
3 of 4
see graph:Exercise scan
Result
4 of 4
$text{Function is: $y=-dfrac{1}{4}(x+6)^{2}+2$}$
Exercise 23
Step 1
1 of 4
$text{Let’s see function $f(x)=x^{2}$. Its graph is right.}$

$text{The domain of a function is the set of all real values of $x$ that will give real values for $y$, domain is interval $(-infty, +infty)$}$

$text{The range of a function is the set of all real values of $y$ that we can get by plugging real numbers into $x$, so, range is interval $[0,+infty)$}$

We can identify the domain and range of functions is by using graphs.

Because the domain refers to the set of possible input values, the domain of a graph consists of all the input values shown on the x-axis

The range is the set of possible output values, which are shown on the y-axis.

Exercise scan

Step 2
2 of 4
$text{Let’s see function $g(x)=sqrt{x}$.}$

$text{The domain of a function is the set of nonegative real values of $x$ that will give real values for $y$, domain is interval $[0, +infty)$}$

$text{The range of a function is the set of all real values of $y$ that we can get by plugging real numbers into $x$, so, range is interval $[0,+infty)$}$

Exercise scan

Step 3
3 of 4
Graphs are both based on a parabola, but open in different directions
$text{ graph of $g(x)$ is only an upper half-parabola.}$
Result
4 of 4
Both graphs are parabolic but $g(x)$ is only an upper half-parabola opening to the right while $f(x)$ is a full parabola opening upwards.

Reflect the right-half of $f(x)$ with respect to the line $y=x$

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