Conic Sections Question 144
Question: If the normals at two points P and Q of a parabola $ y^{2}=4ax $ intersect at a third point R on the curve, then the product of ordinates of P and Q is
Options:
A) $ 4a^{2} $
B) $ 2a^{2} $
C) $ -4a^{2} $
D) $ 8a^{2} $
Show Answer
Answer:
Correct Answer: D
Solution:
As we know, $ t_1\times t_2=2 $
therefore $ 2a t_1 \times 2a t_2 = 4a^2 t_1 t_2 $ .
BETA
