Parabolas Answers

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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
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

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