Q17 of 76 Page 26

The sum of the focal distances of any point on the ellipse 9x2 + 16y2 = 144 is

Given ellipse is 9x2 + 16y2 = 144. It is rewritten as



⇒


⇒


Comparing with standard equation we get


⇒ a2 = 16


⇒ a = 4


We know that the sum of the focal distances of any point on the ellipse is 2a.


⇒ 2(4) = 8


∴ The correct option is D

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