If the two tangents drawn from a point P to the parabola y2 = 4x are a – InterviewSolution

1.

If the two tangents drawn from a point P to the parabola y2 = 4x are at right angles then the locus of P is … (a) 2x + 1 = 0 (b) x = -1 (c) 2x – 1 = 0 (d) x = 1

Answer»

(b) x = -1

When the tangents at drawns from a point on the directrix are at right angles.

So equation of directrix to y² = 4x is x = -1

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