Given, P and Q are the extremities of a focal chord of the parabola y2=4ax Also, P=(9,9) and Q=(p,q) General point on the parabola y2=4ax‌ is ‌(at2,2at) Now, at2=9 and 2at=9 ⇒a=‌
9
4
‌ and ‌t=2 ∵P and Q are the extremities of a focal chord. ∴‌‌p=a(−‌
