Hi

Horizontal Directrix:  y = -10, Parabola Opens Upward (Focus above it)

F(6,0)

(0-10)/2 = -5  V(6, -5), p = 5

y = (1/4p)(x - 6)^2  - 5

y = (1/20)(x - 6)^2  - 5

the vertex form of a Parabola opening up(a>0) or down(a<0),  

where(h,k) is the vertex  and  x = h  is the Line of Symmetry. a = 1/4p

where  the focus is (h,k + p)

With Directrix y = (k - p)

 

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