First, let's find the equation of the parabola with focus (-4, 0) and directrix x = 0.
The standard equation of a parabola with vertex (h, k), focus (h + p, k) and directrix x = h - p is:
(x - h)^2 = 4p(y - k)
In this case, the vertex is (0, 0), the focus is
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