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Find the focus of parabola with equation x^2=-100y.(a) (0, 25)(b) (0, -25)(c) (25, 0)(d) (-25, 0)This question was posed to me in class test.This key question is from Conic Sections in division Conic Sections of Mathematics – Class 11

Answer» CORRECT answer is (B) (0, -25)

The EXPLANATION: Comparing equation with x^2=-4ay.

4a=100 => a=25.

Focus is at (0, -a) i.e. (0, -25).


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