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VCE 11 Methods 2023

4.10 Transformations of functions

Worksheet
Translations
1

Consider the parabola y = x^{2} - 3.

a

Complete the table of values:

b

Sketch the graph of y = x^{2} - 3.

c

What is the y-intercept of the graph?

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d

When adding a constant to the equation y = x^{2}, describe the type of transformation that occurs on its graph.

2

Consider the graph of y = \dfrac{1}{x}:

a

What translation is required to shift the graph of y = \dfrac{1}{x} to get the graph of

y = \dfrac{1}{x} + 4.

b

Hence, sketch y = \dfrac{1}{x} + 4.

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Consider the graph of y = 2^{x}:

a

What translation is required to shift the graph of y = 2^{x} to get the graph of

y = 2^{x} - 5.

b

Hence, sketch y = 2^{x} - 5.

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4

A graph of y = x^{4} is shown. Sketch the curve after it has undergone a transformation resulting in the function

y = x^{4} - 2.

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a

How should you translate the graph of y = f \left( x \right) to get the graph of y = f \left( x \right) + 4 ?

b

How should you translate the graph of y=g(x) to get the graph of y=g(x + 6) ?

6

The functions f \left(x\right) and g \left(x\right) = f \left(x + k\right) have been graphed:

a

Determine the value of k.

b

Describe the transformation that occured.

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7

Describe the shift required to transform the graph of y = a^{x} to get the graph of y = a^{\left(x + 5\right)}.

8

For each of the following equations, determine what the new equation is when their graphs are moved as described:

a

The graph of y = x^{3} is moved to the right by 10 units.

b

The graph of y = 2^{x} is moved down by 9 units.

9

Consider the graph of the hyperbola y = \dfrac{2}{x}:

a

What would be the new equation if the graph was shifted upwards by 2 units?

b

What would be the new equation if the graph was shifted to the right by 9 units?

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10

Consider the graph of y = \sqrt{4 - x^{2}}:

a

What would be the new equation if the graph was translated downwards by 7 units?

b

What would be the new equation if the graph was translated to the left by 3 units?

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11

If the graph of y = x^{4} is moved to the right by 8 units and up by 6 units, what is its new equation?

12

Consider the graph of y = x^{3}:

a

Describe the required translations to shift the graph of y = x^{3} to get the graph of y = \left(x + 2\right)^{3} + 4.

b

Hence, sketch y = \left(x + 2\right)^{3} + 4.

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13

Consider the graph of y = \sqrt{4 - x^{2}}:

a

Describe the required translations to shift the graph of y = \sqrt{4 - x^{2}} to get the graph of y = \sqrt{4 - x^{2}} + 2.

b

Hence, sketch y = \sqrt{4 - x^{2}} + 2.

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14

Consider the graph of y = \sqrt{25 - x^{2}}:

a

Describe the required translations to shift the graph of y = \sqrt{25 - x^{2}} to get the graph of y = \sqrt{25 - \left(x + 4\right)^{2}} - 2.

b

Hence, sketch y = \sqrt{25 - \left(x + 4\right)^{2}} - 2.

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15

The graph of y = P \left(x\right) is shown. Sketch the graph of y = P\left(x\right) - 20.

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Reflections
16

Consider the point P \left(8, - 3 \right). Sketch the point that is symmetric to P \left(8, - 3 \right) with respect to:

a

The x-axis

b

The y-axis

c

The origin

17

State whether the following functions have symmetry. If so, state the line or point of symmetry.

a

y = x^{2} + 1

b

y = x + 5

18

Is the graph shown symmetric with respect to the x-axis, the y-axis, or the origin?

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19

Does the function y = 4 x^{3} have reflective symmetry?

20

For each of the following functions:

i

Find f(-x).

ii

State whether the functions is symmetrical along the x-axis, the y-axis or neither.

a
f(x)=2x^{3}-2x
b
f(x)=0.9x^{6}-7x^{2}+4
c
f(x)=x^{3}+x-3
d
f(x)={\dfrac{1}{6x^3}}
21

Consider the point P = \left( - 6 , 1\right). Find the point obtained by:

a

Reflecting P in the x-axis

b

Reflecting P in the y-axis

c

Rotating P by 180 \degree in the origin

22

Describe the symmetry of the graph of x^{2} + y^{2} = 6.

23

Suppose f is a function such that f \left( 3 \right) = 2. State a point that lies on the graph of f if:

a

The graph of y = f \left( x \right) is symmetric with respect to the origin.

b

The graph of y = f \left( x \right) is symmetric with respect to the y-axis.

c

The graph of y = f \left( x \right) is symmetric with respect to the line x = 6.

d

f is an even function.

e

f is an odd function.

24

The graph of y = P \left(x\right) is shown. Sketch the graph of y = P \left( - x \right).

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Dilations
25

Consider the function f \left( x \right) = \sqrt{x}. Write down the new function g \left( x \right) which results from scaling f \left( x \right) vertically by a factor of \dfrac{1}{3}, and scaling horizontally by a factor of \dfrac{1}{2}.

26

A function f \left(x\right) is transformed into a new function g \left(x\right) = f \left(\dfrac{x}{k}\right). If 0 < k < 1, describe the effect of the transformation on the graph of f \left(x\right).

27

Consider the function f \left(x\right) = \sqrt{x}.

a

Complete the table for f \left(x\right):

b

Sketch a graph of the function f \left( x \right).

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c

Complete the table of values for the transformed function g \left(x\right) = f \left( 4 x\right), giving all values in exact form.

d

Sketch a graph of g \left( x \right).

e

Describe how g \left(x\right) relates to the graph of f \left(x\right).

f

Explain why the transformed function h \left(x\right) = f \left( - 4 x \right) can be undefined for the values of x in the table.

28

The graph of y = P \left(x\right) is shown. Sketch the graph of y = 2 P \left(x\right).

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Combinations of transformations
29

Suppose that the x-intercepts of the graph of y = f \left( x \right) are - 5 and 6.

Find the x-intercepts of the graph of:

a
y = f \left( x + 4 \right)
b
y = f \left( x - 4 \right)
c
y = 3 f \left( x \right)
d
y = f \left( - x \right)
30

Consider the function f \left( x \right) = x^{2} - 5. Using function notation, describe the transformation of f that will result in the function:

a
g \left( x \right) = x^{2} - 6
b
h \left( x \right) = 16 x^{2} - 5
c
k \left( x \right) = 3 x^{2} - 15
31

Consider the graph of y = x^{3}:

Sketch the curve after it has undergone transformations resulting in the function

y = - 4 \left(x + 4\right)^{3}.

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Consider the given graph:

a

Describe the transformations of the graph of y = x^{3} to the given graph.

b

Write down the equation of the given graph.

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33

Consider the graphs of f \left(x\right) = \dfrac{3}{x} and g \left(x\right) shown:

a

Write g \left(x\right) in terms of f(x) using the transformation shown in the graph.

b

State the equation of g \left(x\right).

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Consider the graphs of f \left(x\right) = 2^{x} and g \left(x\right) shown.

a

Write g \left(x\right) in terms of f(x) using the transformation shown in the graph.

b

State the equation of g \left(x\right).

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35

For the following functions, describe the transformations that have occured:

a

From f(x) = x^{4} to g(x) = - 7 \left(x + 4\right)^{4}

b

From f(x) = x^{4} to g(x) = - 5 x^{4} + 8

c

From f(x) = x^{2} to g(x) = - 10 \left(x + 8\right)^{2} - 9

36

The table below shows values that satisfy the function f \left(x\right) = \left|x\right|.

x-3-2-10123
y=f(x)3210123
g(x)=5f(x)
h(x)=-2f(x)
a

Complete the table of values for each transformation of the function f \left(x\right).

b

Sketch the graph of g \left(x\right).

c

Describe how to transform the graph of f \left(x\right) into the graph of g \left(x\right).

d

Sketch the graph of h \left(x\right).

e

Describe how to transform the graph of f \left(x\right) into the graph of h \left(x\right).

37

Three functions have been graphed on the number plane. g \left(x\right) and h \left(x\right) are both transformations of f \left(x\right).

a

State the equation of f \left(x\right).

b

Write g \left(x\right) in terms of f(x) using the transformation shown in the graph.

c

State the equation of g \left(x\right).

d

Write h \left(x\right) in terms of f(x) using the transformation shown in the graph.

e

State the equation of h \left(x\right).

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38

Some points on the graph of the function y = f \left( x \right) are given in the table below:

\text{Original point}g(x)\text{Corresponding point}
(9, -12)g(x)=f(x)-8
(9, -12)g(x)=6f(x)
(6, -7)g(x)=f(x-5)

Complete the table by finding the corresponding points on the graph of y = g \left( x \right).

39

Suppose that \left( - 4 , 3\right) is a point on the graph of y = g \left( x \right). Find the corresponding point on the graph of:

a

y = g \left( x + 7 \right) - 6

b

y = - 6 g \left( x - 4 \right) + 6

c

y = g \left( 6 x + 1 \right)

40

The table below shows coordinates of points on the function y = f(x). By performing the given transformation, find the coordinates of the corresponding transformed points.

\text{Point}\text{Transformation}\text{Transformed point}
(-3, -1)y=f(x-5)-2
(0,3)y=\dfrac{1}{5}f(x-3)
(1, -2)y=f(3x)-2
(-3, 5)y=f\left(\dfrac{x}{2}\right)-5
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Outcomes

U1.AoS1.7

the effect of transformations of the plane, dilation, reflection in axes, translation and simple combinations of these transformations, on the graphs of functions

U1.AoS1.13

describe the effect of transformations on the graphs of relations and functions

U1.AoS2.9

representations of points and transformations

U1.AoS2.4

use of parameters to represent families of functions and determination of rules of simple functions and relations from given information

U1.AoS2.5

transformations of the plane and application to basic functions and relations by simple combinations of dilations (students should be familiar with both ‘parallel to an axis’ and ‘from an axis’ descriptions), reflections in an axis and translations (matrix representation may be used but is not required)

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