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  4. The equation of directrix of the parabola y2=-12x is

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Q. The equation of directrix of the parabola $ {{y}^{2}}=-12x $ is

Rajasthan PETRajasthan PET 2003

Solution:

Comparing the parabola
$ {{y}^{2}}=-12x $ with $ {{y}^{2}}=-4ax, $ we get $ a=3, $
$ \therefore $ Equation of directrix is $ x=3 $