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VCE 11 Methods 2023

4.05 Parabolas

Worksheet
Key features of parabolas
1

Consider the equation x = y^{2}.

a

Find the x-value of the point which has a y-coordinate of 4.

b

Find the x-value of the point which has a y-coordinate of - 4.

c

Find the distance between these two points.

2

Determine whether the following is true of the graph of x = y^{2}:

a

There are always two points that contain the same x-coordinate, except for x = 0.

b

There are always two points that contain the same y-coordinate, except for y = 0.

3

Consider the equation x = y^{2}.

a

Make y the subject.

b

Explain why the graph of y = \pm \sqrt{x} has symmetry.

c

What is the equation of the axis of symmetry of x = y^{2} ?

4

Consider the graph of the relation x = - y^{2}.

a

State two functions that can be combined together to form the same graph as x = - y^{2}.

b

Over which values of x is the relation defined?

5

The point \left(k^{2} - 28 k - 35, 2 k-1\right) lies on the curve x = y^{2}. Find the values of k.

6

For each of the following parabolas:

i

State the coordinates of the vertex.

ii

State whether the parabola opens upward or downwards.

a

y = - \left(x + 5\right)^{2} + 4

b

y - 5 = - \left(x + 4\right)^{2}

c

\left(x - 3\right)^{2} = y + 2

d
y = - \left(x + 5\right)^{2} + 2
e
\left(x + 2\right)^{2} + 6 = y
7

Consider the parabola with equation \left(x + 1\right)^{2} = 8 y.

a

State the coordinates of the vertex of the parabola.

b

Determine the distance of the point \left(3, 2\right) from the vertex.

8

For each of the following parabolas:

i

State the coordinates of the vertex.

ii

State whether the parabola opens to the left or right.

a
\left(y - 5\right)^{2} - 4 = x
b
x = - \left(y + 6\right)^{2} + 3
9

Find the coordinates of the vertex of the parabola: x = \left(y + 3\right)^{2} - 4.

10

Consider the parabola with equation x = 2 \left(y - 4\right)^{2} - 1.

a

Is this a horizontal or vertical parabola?

b

Does the parabola open left or right?

c

What are the coordinates of the vertex?

11

For each of the following parabolas:

i

State the coordinates of the vertex.

ii

In which direction does the parabola open?

a

y - 4 = \left(x + 5\right)^{2}

b

y - 2 = - \left(x + 5\right)^{2}

c

x - 4 = \left(y + 2\right)^{2}

d

x - 5 = - \left(y + 3\right)^{2}

12

Find the coordinates of the vertex of the parabola with equation x = - 3 y^{2} + 12 y + 11

Graph parabolas
13

Consider the parabola x = y^{2}.

a

State the range of values of x for which the relation is defined.

b

Complete the table for the values of x:

c

Plot the points from the table of values on a number plane.

d

Sketch the graph of the curve that passes through the plotted points.

x
y-3-2-10123
e

How many points on the graph correspond to any one particular value of x, for x > 0?

14

Consider the parabola x = - \dfrac{1}{4} y^{2}.

a

Complete the following table of coordinate pairs for the given equation:

b

Sketch the graph of the parabola.

x
y-2-101234
15

Consider the parabola x = y^{2} whose graph is shown:

a

How many points on the graph have an \\x-coordinate of 81?

b

State the values of y that correspond to an x-value of 81.

27
54
81
x
-9
-6
-3
3
6
9
y
16

Consider the parabola x = y^{2} + 4.

a

Complete the following table of coordinate pairs:

b

Sketch the graph of the parabola.

x
y-2-1012
17

Consider the parabola x = \left(y - 4\right)^{2}.

a

Complete the following table of coordinate pairs:

b

Sketch the graph of the parabola.

x
y234567
18

Consider the parabola x = \dfrac{1}{4} y^{2}.

a

Sketch the graph of the parabola.

b

State the coordinates of the x-intercept.

19

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

a

Complete the following table of coordinate pairs:

b

Sketch the graph of the parabola.

c

State the coordinates of the x-intercept.

x
y-2-1012
20

For each of the following equations:

i

Sketch the graph of the parabola.

ii

State the domain of the function in interval notation.

iii

State the range of the function in interval notation.

a

y - 5 = x^{2}

b

y = \left(x + 4\right)^{2}

c

x + 2 = y^{2}

d

x = \left(y - 3\right)^{2}

e

y + 5 = \left(x + 2\right)^{2}

f

x - 1 = \left(y - 3\right)^{2}

g

y - 2 = - \dfrac{1}{3} \left(x - 1\right)^{2}

h

x - 2 = - 3 \left(y - 5\right)^{2}

i

y = x^{2} + 4 x + 3

j

x = y^{2} - 4 y + 3

k

y + 3 x^{2} - 24 x + 53 = 0

l

x + 3 y^{2} - 30 y + 78 = 0

m
x = \left(y - 3\right)^{2} - 5
n
y = \left(x + 2\right)^{2}-1
o
y = - 2 \left(x + 2\right)^{2} + 4
p
x = - \dfrac{1}{4} \left(y + 4\right)^{2} + 5
21

Consider the graphs of y= x^{2} and

x = y^{2} shown:

Describe the transformation required to transform y= x^{2} into x = y^{2}.

-5
-4
-3
-2
-1
1
2
3
4
5
x
-5
-4
-3
-2
-1
1
2
3
4
5
y
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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.AoS1.12

draw graphs of polynomial functions of low degree, simple power functions and simple relations that are not functions

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