1.

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

Answer»

(2) x = –1 

The locus of perpendicular tangents is directrix. i.e, x = –a; x = –1



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