Question 423860
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Hi
The standard form is {{{(x -h)^2 = 4p(y -k)}}}, where the focus is (h,k + p) 
vertex at the origin and a directrix at y = 5. p = -5 (focus is (0,-5) 
 x^2 = -20y  OR y = (-1/20)x^2
 
{{{drawing(300,300, -6, 6, -6, 6, grid(1),
circle(0, -5,0.3),
graph( 300, 300, -6, 6, -6, 6,0,5,(-1/20)x^2 ))}}}