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Find the equation of directrix of parabola x^2=-100y.(a) x=25(b) x=-25(c) y=-25(d) y=25The question was posed to me during a job interview.Enquiry is from Conic Sections topic in division Conic Sections of Mathematics – Class 11

Answer» CORRECT option is (d) y=25

Easiest EXPLANATION: COMPARING equation with x^2=-4ay.

4a=100 => a=25. Directrix is a line parallel to latus rectum in such a way that vertex is at middle of both.

Equation of directrix is y=a => y=25.


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