Question 419366
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Hi
parabola with a vertex at the origin and a directrix at y = 5
The standard form is {{{(x -h)^2 = 4p(y -k)}}}, where the focus is (h,k + p) 
p = -5
 parabola opening downward y = -20x^2
{{{drawing(300,300,   -6, 6, -6, 6,  grid(1),
circle(0, 0,0.3),
circle(-0, -5,0.3),
graph( 300, 300, -6, 6, -6, 6,0,5,-20x^2))}}}