Find the equation of the parabola with focus (0, -4) and directrix y = -2
i barely understand this thing. i mean how do i find the vertex.
the book says D1 = focus to any point on the graph, and D2= the point on the graph to the directrix. and D1 = D2. how do i graph if i dont know the vertex
The Attempt at a Solution
answer: y + 3 = -1/4(x)2