Parabolas

Question 1

The parabola has a focus at (−3, 0) and directrix x = 3. What is the correct equation for the parabola?

Revolt · Accepted Answer

y2 = −12x

Question 2

Which statements are true for the equation x2 = −4y? Check all that apply.The axis of symmetry is x = 0.The focus is at (0, –1).The parabola opens up.The parabola opens right.The value of p = −1.The equation for the directrix is y = 0.

Revolt · Accepted Answer

The axis of symmetry is x = 0.; The focus is at (0, –1).; The value of p = −1.

Question 3

If the directrix of a parabola is the horizontal line y = 3, what is true of the parabola?

Revolt · Accepted Answer

The focus is at (0, –3), and the equation for the parabola is x2 = –12y.

Parabolas Answers

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