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1.12 Transformations of functions

Worksheet
What do you remember?
1

Consider the function f(x) and its transformations:

a

What transformation of f(x) does g(x) = f(x) + 3 represent and how does the graph change?

b

What transformation of f(x) does g(x) = f(x - 2) represent and how does the graph change?

2

The function g(x) = 2f(x) is a transformation of the function f(x). What type of transformation is this and how does it affect the graph of f(x)?

3

The function g(x) = f(3x) is a transformation of the function f(x). What type of transformation is this and how does it affect the graph of f(x)?

4

What happens to the graph of a function f(x) when it undergoes both an additive and a multiplicative transformation?

5

How can the domain and range of a function change when it undergoes a transformation?

Let's practice
6

Given the function f(x) = x^2, find the new function g(x) after it has been translated vertically by the following values of k:

a

k = 3

b

k = -2

c

k = 5

d

k = -7

7

The function f(x) = x^3 - 2x^2 + x is translated vertically so that its new equation is \\g(x) = x^3 - 2x^2 + x + 8. Determine the vertical translation.

8

Given the function f(x) = x^3, find the equation for the function g(x) that represents f(x) translated horizontally by 5 units to the right.

9

The graph of the function f(x) = |x| is horizontally translated to produce the graph of g(x). If the vertex of g(x) is at the point (2,\, 0), find the equation of g(x).

10

Given the function f \left( x \right) = \dfrac{1}{x}, find the equation of the function g \left( x \right) such that g \left( x \right) is a vertical dilation of f \left( x \right) by a factor of 3 and a reflection over the x-axis.

11

For each of the following functions:

i

Identify the value of b.

ii

Describe the horizontal dilation and reflection, if any, of the graph of the function.

a
f\left(x\right)=3\left(2x\right)^2
b
f\left(x\right)=\dfrac{1}{3}\left(-4x\right)^3
c
f\left(x\right)=-\left(\dfrac{1}{2}x\right)^4
d
f\left(x\right)=5\left(\dfrac{3}{4}x\right)^5
12

A function g(x) is created by applying a vertical dilation of 2, a horizontal reflection, a horizontal shift of 4 units to the left, and a vertical shift of 3 units down to the parent function f(x) = x^2. Find the equation of g(x).

13

Given the parent function f(x) = |x|, determine the domain and range of each transformed function:

a

g(x) = |x - 2|

b

g(x) = 3|x| + 1

c

g(x) = -|x + 4|

d

g(x) = \dfrac{1}{2}|x|

Let's extend our thinking
14

Consider the function f(x) = x^2. Perform the following transformations:

a

Vertically translate the graph by 3 units up. Write the equation for the transformed function.

b

Horizontally translate the graph by 2 units to the right. Write the equation for the transformed function.

c

Vertically dilate the graph by a factor of 2. Write the equation for the transformed function.

d

Horizontally dilate the graph by a factor of 0.5. Write the equation for the transformed function.

15

Consider the function f(x) = x^2 and its transformation into g(x) = (x - 1)^2 + 3. If you didn't know the equation of f(x), but you had the graph of g(x), how could you determine the equation of f(x)?

16

Consider a function f(x) and its transformations g(x) and h(x) defined as follows:

  • g(x) = f(2x - 3) + 4, which is a combination of horizontal dilation, horizontal translation, and vertical translation.

  • h(x) = -3f(x + 1) - 2,which is a combination of vertical dilation, reflection over the x-axis, horizontal translation, and vertical translation.

a

Assume that the graph of f(x) passes through the point (2,\, 5). Determine the coordinates of the corresponding points on the graphs of g(x) and h(x).

b

Explain the effects of each transformation on the domain and range of f(x) when forming g(x) and h(x).

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Outcomes

1.12.A

Construct a function that is an additive and/or multiplicative transformation of another function.

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