Hi,
the vertex form of a Parabola opening right(a>0) or left(a<0), 
where(h,k) is the vertex and y = k is the Line of Symmetry
The standard form is
, where the focus is (h +p,k )
parabola with its vertex at (-1, 2) and its focus at (4, 2)
,
, p = 5, 4p = 20
,
