Parabolas Answers

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A parabola is represented by the equation x2 = 4y.

A
(0,4)
B
(0,1)
C
(1,0)
D
(4,0)
2
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A parabola has a vertex at the origin. The equation of the directrix of the parabola is y = 3.

A
(0,3)
B
(3,0)
C
(0,–3)
D
(–3,0)
3

A parabola, with its vertex at (0,0), has a focus on the negative part of the y-axis.Which statements about the parabola are true? Select two options.The directrix will cross through the positive part of the y-axis.The equation of the parabola will be in the form y2 = 4px where the value of p is negative.The equation of the parabola will be in the form x2 = 4py where the value of p is positive.The equation of the parabola could be y2 = 4x.The equation of the parabola could be x2 = y.

Question illustration
A
The directrix will cross through the positive part of the y-axis.
B
The equation of the parabola will be in the form y2 = 4px where the value of p is negative.
C
The equation of the parabola will be in the form x2 = 4py where the value of p is positive.
D
The equation of the parabola could be y2 = 4x.
E
The equation of the parabola could be x2 = y.
Option E
4

The focus of a parabola is located at (0,–2). The directrix of the parabola is represented by y = 2.

A
y2 = –2x
B
x2 = –2y
C
y2 = –8x
D
x2 = –8y
5

A parabola has a vertex at (0,0). The focus of the parabola is located on the positive y-axis.

A
up
B
down
C
left
D
right
6

A parabola is represented by the equation y2 = 5x.

A
y = –20
B
x = –20
C
y =
Option C
D
x =
Option D
7

On a coordinate plane, a parabola opens upward. It has a vertex at (0, 0), a focus at (0, 1.5) and a directrix at y = negative 1.5.

Question illustration
A
y2 = 1.5x
B
x2 = 1.5y
C
y2 = 6x
D
x2 = 6y
8

A parabola can be represented by the equation y2 = –x.

A
focus: ; directrix: x =
Option A
B
focus: ; directrix: x =
Option B
C
focus: (–4,0); directrix: x = 4
D
focus: (4,0); directrix: x = –4
9

The focus of a parabola is located at (4,0), and the directrix is located at x = –4.

A
y2 = –x
B
y2 = x
C
y2 = –16x
D
y2 = 16x
10

A parabola can be represented by the equation x2 = –20y.

A
(–5,0)
B
(5,0)
C
(0,5)
D
(0,–5)

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Parabolas Answers — CR CCSS Math 2 S2 M2960OX