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AustraliaVIC
VCE 11 Methods 2023

4.07 Cube root functions

Worksheet
Graphs of cube root functions
1

Consider the function y = \sqrt[3]{x}.

a

Complete the table of values. Round any values to two decimal places if necessary.

x-100-10-8-3-1013810100
y
b

Sketch the graph of y = \sqrt[3]{x}.

c

Is y = \sqrt[3]{x} an increasing function or a decreasing function?

d

Is there any restriction on the value of x?

e

State the range of the function.

f

Does y = \sqrt[3]{x} have a limiting value?

g

Does y = \sqrt[3]{x} have an asymptote?

h

As x gets larger and larger, what value does y approach?

i

For x \geq 0, describe the rate of increase of the function as x increases.

j

For x \geq 0, describe the rate of describe the rate of increase of the function as x increases.

2

Consider the function y = - \sqrt[3]{x}.

a

Complete the table of values. Round any values to two decimal places if necessary.

x-100-10-8-3-1013810100
y
b

Sketch the graph of the function.

c

Can the function values ever be positive?

d

Can the function value ever be 0?

e

State the domain of the function.

f

State the range of the function.

g

Is y = - \sqrt[3]{x} an increasing function or a decreasing function?

h
Describe the rate of increase/decrease of the function y = - \sqrt[3]{x} on either side of x=0.
3

Consider the function y = \sqrt[3]{ - x }.

a

Complete the table of values. Round any values to two decimal places if necessary.

x-100-10-8-3-1013810100
y
b

Sketch the graph of y = \sqrt[3]{ - x }.

c

Is y = \sqrt[3]{ - x } an increasing function or a decreasing function?

d

State the domain of the function.

e

State the range of the function.

f

As x approaches -\infty, what does y approach?

g

As x approaches \infty, what does y approach?

4

Consider the function y = \sqrt[3]{x} + 3.

a

Can y ever be negative?

b

As x gets larger and larger, what value does y approach?

c

Determine the y-intercept of the curve.

d

How many x-intercepts does it have?

e

Sketch the graph of y = \sqrt[3]{x} + 3.

5

Consider the function y = - 5 \sqrt[3]{x}.

a

State the domain of the function.

b

State the range of the function.

c

Sketch the graph of y = - 5 \sqrt[3]{x}.

6

Consider the function f \left(x\right) = \sqrt[3]{x-1}.

a

Complete following table of values:

x-70129
\sqrt[3]{x-1}-2
b

Sketch the graph of the function.

c

State the domain of the function.

d

State the range of the function.

7

Consider the function f \left(x\right) = \sqrt[3]{x}-1.

a

Complete following table of values:

x-8-1018
\sqrt[3]{x}-1-3
b

Sketch the graph of the function.

c

State the domain of the function.

d

State the range of the function.

8

Consider the following functions:

i

Sketch the graph of the function.

ii

State the domain of the function.

iii

State the range of the function.

a
f \left(x\right) = \dfrac{1}{2} \sqrt[3]{x}
b
f \left(x\right) = \dfrac{\sqrt[3]{ - x }}{3}
c
f \left(x\right) = \sqrt[3]{ \dfrac{1}{3} x}
d
f \left(x\right) = \sqrt[3]{x-1} + 4
e
f \left(x\right) = \sqrt[3]{ - x } - 5
f
f \left(x\right) = \sqrt[3]{\dfrac{x + 4}{2}}
g
f \left(x\right) = \sqrt[3]{ - \left( x - 5 \right)}
h
f \left(x\right) = 3 \sqrt[3]{x} - 2
i
f \left(x\right) = \dfrac{\sqrt[3]{ 4 x}}{2}
j
f \left(x\right) = \sqrt[3]{ - \dfrac{x}{2} }
Characteristics of cube root functions
9

Describe how the function y = 5 \sqrt[3]{x} differs from y = \sqrt[3]{x}.

10

State the domain and range of y = \sqrt[3]{x} - 4.

11

Consider the function y = \sqrt[3]{x - 4}.

a

State the domain of the function.

b

State the range of the function.

c

Compare the rate of increase of y = \sqrt[3]{x - 4} and y = \sqrt[3]{x}.

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Outcomes

U1.AoS1.2

qualitative interpretation of features of graphs of functions, including those of real data not explicitly represented by a rule, with approximate location of any intercepts, stationary points and points of inflection

U1.AoS1.3

graphs of power functions f(x) = x^n for n=-2, -1, 1/3, 1/2, 1,2,3,4 and transformations of these graphs to the form y=a(x+b)^n+c

U1.AoS1.11

sketch by hand graphs of power functions f(x) = x^n for n=-2, -1, 1/3, 1/2, 1,2,3,4 and simple transformations of these, and identify any vertical or horizontal asymptotes

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