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Find the equation of directrix of parabola y^2=100x.(a) x=25(b) x=-25(c) y=25(d) y=-25This question was addressed to me in my homework.I want to ask this question from Conic Sections in section Conic Sections of Mathematics – Class 11

Answer»

The correct answer is (B) x=-25

The best I can EXPLAIN: Comparing equation with y^2=4ax.

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 x=-a => x=-25.



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