Hint:
The focus is at (5,-1), and the directrix is at x=3, so the vertex lies halfway between the two.
The value of p is the distance between the vertex and the focus.
Wiki has an excellent article on the subject.
http://en.wikipedia.org/wiki/Parabola
Identify the equation of a parabola whose focus is at (5,-1) and whose directrix is x=3.
vertex=(-5,-1)
p=-6
4p=-24
(x-5)=(-24)(y+1)^2
I got it wrong
1 answer