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VCE 12 Methods 2023

2.02 Transformations of power functions

Worksheet
Power functions
1

Do the following graphed functions have an even or odd power?

a
-4
-3
-2
-1
1
2
3
4
x
-4
-3
-2
-1
1
2
3
4
y
b
-4
-3
-2
-1
1
2
3
4
x
-4
-3
-2
-1
1
2
3
4
y
c
-4
-3
-2
-1
1
2
3
4
x
-4
-3
-2
-1
1
2
3
4
y
d
-4
-3
-2
-1
1
2
3
4
x
-4
-3
-2
-1
1
2
3
4
y
e
-4
-3
-2
-1
1
2
3
4
x
-4
-3
-2
-1
1
2
3
4
y
2

Consider the function y = x^{2}.

a

Sketch the curve on a number plane.

b

Are the y-values ever negative?

c

Write down the equation of the axis of symmetry.

d

What is the minimum y-value?

e

For every y-value greater than 0, how many corresponding x-values are there?

3

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

a

As x becomes larger in the positive direction (ie x approaches infinity), what happens to the corresponding y-values?

b

As x becomes larger in the negative direction (ie x approaches negative infinity), what happens to the corresponding y-values?

-4
-3
-2
-1
1
2
3
4
x
-4
-3
-2
-1
1
2
3
4
y
Transformations of power functions
4

Consider the functions y = x^{2}, y = x^{4} and y=x^6.

a

Describe the general shape of the graph of each function.

b

Sketch the graph of y = x^{2}, y = x^{4} and y=x^6 on the same number plane.

c

Describe what happens to the graph of a function of the form y=x^{2n} as n increases.

5

Consider the functions f \left( x \right) = - x^{4} and g \left( x \right) = - x^{6}.

a

Graph f \left( x \right) = - x^{4} and g \left( x \right) = - x^{6} on the same set of axes.

b

Which of the above functions has the narrowest graph?

6

Consider the functions f(x) = x^{3} and g(x) = x^{5}.

a

Graph f(x) = x^{3} and g(x) = x^{5} on the same set of axes.

b

How would the graph of y = x^{7} differ to the graph of f(x) = x^{3} and g(x) = x^{5} ?

7

Consider the function y = - x^{7}.

a

As x approaches infinity, what happens to the corresponding y-values?

b

As x approaches negative infinity, what happens to the corresponding y-values?

c

Sketch the general shape of y = - x^{7}.

8

Consider the function y = 2 x^{2}.

a

Complete the following table of values:

x- 2- 1012
y
b

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

c

For y = a x^{2}, as a increases, how does it change the graph of y = x^{2}?

9

Consider the curve y = x^{3} - 8.

a

Find the x-intercept.

b

Find the y-intercept.

c

Find the horizontal point of inflection.

d

Sketch the graph of the curve.

10

The graph of y = x^{4} has been provided on the following coordinate axes:

Sketch the graph of y = \dfrac{1}{2} x^{4}.

-2
-1
1
2
x
-2
2
4
6
8
10
12
14
16
18
y
11

Consider the function y = x^{4} - 4.

a

Complete the table of values for y = x^{4}:

x-2-1012
y
b

Use the graph of y = x^{4} to sketch the graph of y = x^{4} - 4.

c

What is the y-intercept of the graph \\ y = x^{4} - 4?

d

What type of transformation occurs on the graph when adding a constant to the equation y = x^{4}?

-4
-2
2
4
x
-6
-4
-2
2
4
6
8
10
12
14
16
18
y
12

Consider the function y = - x^{5} - 5.

a

Sketch the general shape of the function y = - x^{5}.

b

Sketch the graphs of y = - x^{5} and y = - x^{5} - 5 on the same number plane.

c

What is the y-intercept of the graph y = - x^{5} - 5?

13

Consider the function y = \left(x - 2\right)^{2}.

a

Complete the following table of values:

x01234
y
b

Sketch the graph of y = \left(x - 2\right)^{2}.

c

What is the minimum y-value?

d

What x-value corresponds to this minimum y-value?

e

State the coordinates of the vertex.

14

Consider the quadratic function y = - \left(x + 2\right)^{2} - 6.

a

Calculate the y-value of the y-intercept.

b

Is the graph concave up or concave down?

c

What is the maximum y-value?

d

What x-value corresponds to the maximum y-value?

e

State the coordinates of the vertex.

f

Sketch the graph the parabola.

g

What is the axis of symmetry of the parabola?

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Outcomes

U34.AoS1.2

graphs of the following functions: power functions, y=x^n; exponential functions, y=a^x, in particular y = e^x ; logarithmic functions, y = log_e(x) and y=log_10(x) ; and circular functions, 𝑦 = sin(𝑥) , 𝑦 = cos (𝑥) and 𝑦 = tan(𝑥) and their key features

U34.AoS1.7

the key features and properties of a function or relation and its graph and of families of functions and relations and their graphs

U34.AoS1.14

identify key features and properties of the graph of a function or relation and draw the graphs of specified functions and relations, clearly identifying their key features and properties, including any vertical or horizontal asymptotes

U34.AoS1.10

the concepts of domain, maximal domain, range and asymptotic behaviour of functions

U34.AoS1.18

sketch by hand graphs of polynomial functions up to degree 4; simple power functions, y=x^n where n in N, y=a^x, (using key points (-1, 1/a), (0,1), and (1,a); log x base e; log x base 10; and simple transformations of these

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