Find the standard form of the equation of the parabola with a focus at (3, 0) and a directrix at x = -3.

Question

tkhunny · Answer

Please show your efforts.  Surely you have something.

anonymous · Answer

I really don't have much right now because I'm not sure about where to start :/
I know that the focus is (h,k+p) for vertical and (h+p,k) for horizontal but I don't even see how to know which one it is from the information given...which leaves me with both directrix formulas too

anonymous · Answer

If anybody else can help me; I got farther.  

I know that it's horizontal and it opens to the left, so the equation is:
$$(y-k)^2=4p(x-h)$$

I need to find h, k, and p from there, and I know that the distance from the focus to the directrix is 2p.

From here on, how do I know what to set 2p equal to?

anonymous · Answer

|dw:1403054128987:dw|
your parabola has that form