The parabola whose equation is y^2 = 12x has directrix x = 3 x = -3 y = 3 y = -3

You can use the vertex form, y = a(x - h)^2 +k, to find the directrix.

The directrix is a fixed line associated with a parabola.

In this case, the directrix is x = -3

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X=-3 is your answer plz like it and I will continue to do my best at answering these and helping others out so they can pass.