Answer :

Since the focus (0, - 3) lies on the y-axis, the y-axis itself is the axis of the parabola. Hence the equation of the parabola is of the form, either x

^{2}= 4ay or x

^{2}= - 4ay. As the directrix is y = 3, the equation of the parabola is x

^{2}= -4 × 3ay = -12y or x

^{2}= -12y.

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