If two tangents drawn from a point to the parabola are at right angles

MATHEMATICS · Single correct · ISC · Mathematics · Coordinate Geometry · Coordinate Geometry

Problem

If two tangents drawn from a point PP to the parabola y2=4xy^2=4x are at right angles, the locus of PP is (1) 2x+1=02x+1=0 (2) x=−1x=-1 (3) 2x−1=02x-1=0 (4) x=1x=1

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