(y-k)^2 = 4p(x-h)
(h,k) is the vertex
Vertex (0, 0), so h=0 and k=0
Focus (7, 0)
p is the distance between the vertex and the focus : (0,0) and (7,0)
p = sqrt ( (0-7)^2 +(0-0)^2 ) = 7
so (y-0)^2 = 4*7*(x-0)
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