SOLUTION: what is the directrix of the parabola with the equation y^2=12x

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Question 750690: what is the directrix of the parabola with the equation y^2=12x
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
Comparing to the derived parabola in standard position your equation would seem to be x=%281%2F12%29y%5E2, where 1%2F%284p%29=1%2F12. The meaning of p is the focal length. It is also how far the vertex is from the focus. Find p.

Note, your parabola opens to the right and vertex is at the left.