Question

Find the equation of a parabola with vertex (3, 5) and directrix y = 7.

Answer 1

Answer: -8(y-5) = (x-3)2

Step-by-step explanation:

Well, p(y-k) = (x-h)2 has Vertex (h,k) = (3,5).  So the Distance from vertex to directrix is 2; distance from vertex to focus is 2; focus is directly beneath the vertex.  Therefore it's  p = -2  ( I hope this helped<3)