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The given equation is x2 = –9y.
Here, the coefficient of y is negative. Hence, the parabola opens downwards.
On comparing this equation with x2 = –4ay, we obtain
∴Coordinates of the focus =
Since the given equation involves x2, the axis of the parabola is the y-axis.
Equation of directrix,
Length of latus rectum = 4a = 9
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