Question 633533
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Hi,
parabola: Vertex V(-1, 0), focus F(-4, 0)  p = -3
 y^2 = -12(x + 1)
the vertex form of a Parabola opening right(a>0) or left(a<0), {{{x=a(y-k)^2 +h}}}
 where(h,k) is the vertex and  y = k  is the Line of Symmetry
The standard form is {{{(y -k)^2 = 4p(x -h)}}}, where  the focus is (h +p,k )