A chord of parabola y^2 = 4ax subtends a right angle at the vertex. The tangents at the extremities of the chord intersect on (A) x+a = 0 (B) x + 2a = 0 (C) x+3a = 0 .(D) x +4a = 0
A chord of parabola y^2 = 4ax subtends a right angle at the vertex. The tangents at the extremities of the chord intersect on
(A) x+a = 0 (B) x + 2a = 0 (C) x+3a = 0 .(D) x +4a = 0