What is the equation of a parabola with a directrix x = 8 and focus (-8,0)

From the given information, the parabola is a sideways parabola facing left with vertex at the origin.

Required equation is (y - 0) ^2 = 4p (x - 0)

y^2 = 4px

But 0 + p = - 8 = > p = - 8

Therefore, required equation is y^2 = 4 (-8) x

y^2 = - 32x