Find equation of parabola with focus and directrix

  • #1

Homework Statement


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

Homework Equations





The Attempt at a Solution


answer: y + 3 = -1/4(x)2
 

Answers and Replies

  • #2
The vertex is the midpoint between the focus and the directrix.
 

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