topic badge

2.07 Graphs of quartics

Worksheet
Quartic functions
1

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

a

Determine the leading coefficient of the polynomial function.

b

Is the degree of the polynomial odd or even?

c

Does the curve rise or fall to the left?

d

Does the curve rise or fall to the right?

e

Sketch the graph of y = - x^{4} + 4.

2

For each of the following functions:

i

Find the x-intercepts.

ii

Find the y-intercept.

iii

Sketch the graph.

a
y = 16 \left(x - \dfrac{1}{2}\right)^{4} - 81
b
y = \left(x + 1\right)^{4} - 16
3

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

-6
-5
-4
-3
-2
-1
1
2
x
-50
-40
-30
-20
-10
10
20
30
40
50
y
4

Consider the function y = - \left(x - 1\right)^{4} + 3.

a

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

b

As x \to \infty, what does y approach?

c

What is the y-intercept of the function?

d

Sketch the graph of the function.

5

Consider the function y = \left(x - 1\right)^{4} - 3.

a

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

b

As x \to \infty, what does y approach?

c

What is the y-intercept of the function?

d

Sketch the graph of the function.

6

Sketch the graph of the function f \left( x \right) = 2 \left(x - 1\right)^{4} - 2.

7

Consider the curve y = 4 \left(x + 3\right)^{4} - 64.

a

Find the x-intercepts.

b

Find the y-intercept.

c

By how many units has the original power function y = 4(x+3)^4 been translated vertically down to get the above function?

d

Sketch the graph of the function.

8

Consider the curve y = - 3 \left(x - 2\right)^{4} + 32.

a

Find the x-intercept(s) in exact form.

b

Find the y-intercept.

c

By how many units has the original power function y = -3x^4 + 32 been translated horizontally to the right to get the above function?

d

Sketch the graph of the function.

9

Consider the curve y = - 81 \left(x - 5\right)^{4} + 16.

a

Find the x-intercepts.

b

Find the y-intercept.

c

What is the vertical dilation factor from the original power function y = (x-5)^4?

d

Sketch the graph of the function.

Find equations from graphs
10

For each of the following graphs of quartic functions in the form y = a\left(x-h\right)^4 + k:

i

State the coordinates of the turning point.

ii

State the equation for the quartic function.

a
1
2
3
4
5
6
7
8
x
4
8
12
16
20
24
28
32
36
y
b
1
2
3
4
5
x
-14
-12
-10
-8
-6
-4
-2
2
4
6
8
10
12
14
y
11

For each of the following graphs of quartic functions find the equation of the graph in factored form:

a
-5
-4
-3
-2
-1
1
2
3
4
5
6
x
-32
-28
-24
-20
-16
-12
-8
-4
4
8
12
16
20
24
28
32
y
b
-5
-4
-3
-2
-1
1
2
3
x
-6
-4
-2
2
4
6
8
10
y
c
-4
-3
-2
-1
1
2
3
x
-4
4
8
12
16
20
24
y
d
-2
-1
1
2
3
4
x
-1
1
2
3
4
5
6
7
y
e
-4
-3
-2
-1
1
2
3
4
x
-16
-12
-8
-4
4
8
12
y
f
-4
-3
-2
-1
1
2
3
4
x
-8
-4
4
8
y
12

Find the equations of the following quartic functions, given the graph of the function:

a

Cuts through the x-axis when x=2, -1, -5 and \dfrac{2}{3} and has a y-intercept of \left(0,10\right).

b

Cuts through the x-axis at \left(-4,0\right) and \left(1,0\right), touches at \left(2,0\right) and has a y-intercept of \left(0,6\right).

c

Has stationary point of inflection at \left(3, 0\right), cuts through the x-axis at \left(8,0\right) and has a \\y-intercept of \left(0, 12\right).

Sign up to access Worksheet
Get full access to our content with a Mathspace account

Outcomes

1.2.4.6

recognise and determine features of the graphs 𝑦=𝑎(𝑥−𝑏)^4+𝑐, including shape and behaviour

What is Mathspace

About Mathspace