Parabolas — Quiz Answers

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A parabola is represented by the equation y squared is equal to 5 x Which equation represents the directrix?

A
x is equal to negative 5 fourths
B
y is equal to negative 20
C
y is equal to negative 5 fourths
D
x is equal to negative 20
2
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A parabola can be represented by the equation y squared is equal to negative x What are the coordinates of the focus and the equation of the directrix?

A
focus: open paren 1 fourth comma 0 close paren ; directrix: x is equal to negative 1 fourth
B
focus: open paren 4 comma 0 close paren ; directrix: x is equal to negative 4
C
focus: open paren negative 4 comma 0 close paren ; directrix: x is equal to 4
D
focus: open paren negative 1 fourth comma 0 close paren ; directrix: x is equal to 1 fourth
3

A parabola can be represented by the equation x squared is equal to negative 20 y What are the coordinates of the focus of the parabola?

A
open paren negative 5 comma 0 close paren
B
open paren 0 comma negative 5 close paren
C
open paren 5 comma 0 close paren
D
open paren 0 comma 5 close paren
5

A parabola is represented by the equation x squared is equal to 4 y What are the coordinates of the focus of the parabola?

A
open paren 0 comma 4 close paren
B
open paren 4 comma 0 close paren
C
open paren 0 comma 1 close paren
D
open paren 1 comma 0 close paren
6

A parabola has a vertex at the origin. The equation of the directrix of the parabola is y is equal to 3 What are the coordinates of its focus?

A
open paren 0 comma negative 3 close paren
B
open paren 0 comma 3 close paren
C
open paren 3 comma 0 close paren
D
open paren negative 3 comma 0 close paren

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Parabolas — Quiz Answers — Geometry