# Math Help - parabola

1. ## parabola

Find the directrix of the parabola 12(y+4)= (y-6)2 (square)

Choices:

a. -7
b. -1
c. 3
d. 9

2. ccdalamp, if you don't understand something about a post, then please respond within the same thread. To post the question over in another thread is rather insulting to Jhevon.

By the way, there is a typo in your equation:
$12(y + 4) = (y - 6)^2$
is not a parabola, it is an equation for y. To be a parabola one of those y's must be an x. Which is it?

-Dan