The points P (ap2, 2ap) and Q(aq2, 2aq) lie on the parabola y2 = 4ax. Prove that if PQ is a focal chord then the tangents to the curve at P and Q intersect at right angles at a point on the directrix.

f(x) is going down by 4

step-by-step explanation:

(its either that or its going left by 4)

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step-by-step explanation: