SOLUTION: Write an equation of a parabola with a vertex at the origin and a directrix at y = 5

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Question 419366: Write an equation of a parabola with a vertex at the origin and a directrix at y = 5
Answer by ewatrrr(24785) About Me  (Show Source):
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Hi

parabola with a vertex at the origin and a directrix at y = 5

The standard form is %28x+-h%29%5E2+=+4p%28y+-k%29, where the focus is (h,k + p) 

p = -5

 parabola opening downward y = -20x^2