Parabolas (Sec 9-4)

Question 1

Which statements describe a parabola? Check all that apply.A parabola is the set of all points equidistant from the directrix and focus.The fixed line is called the vertex of a parabola.The focus is a fixed point inside the parabola.The line of symmetry intersects the focus and directrix.The line of symmetry and the directrix are perpendicular.The parabola intersects the directrix.

Revolt · Accepted Answer

A parabola is the set of all points equidistant from the directrix and focus.; The focus is a fixed point inside the parabola.; The line of symmetry intersects the focus and directrix.; The line of symmetry and the directrix are perpendicular.

Question 2

The coordinates of the focus are .

Revolt · Accepted Answer

(–1,0)

Question 3

The equation of the directrix is .

Revolt · Accepted Answer

x = 1

Question 4

y2 =

Revolt · Accepted Answer

4px

Question 5

Therefore, the value of p is .

Revolt · Accepted Answer

–1

Question 6

The value of p is .

Revolt · Accepted Answer

10

Question 7

The parabola opens .

Revolt · Accepted Answer

up

Question 8

The coordinates of the focus are .

Revolt · Accepted Answer

(0,10)

Question 9

The equation for the directrix is .

Revolt · Accepted Answer

y = –10

Parabolas (Sec 9-4) Answers

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