Q. The sum of the focal distances from any point on the ellipse $9x^{2} + 16y^{2} = 144$ is
A) 3
B) 6
C) 8
D) 4
Explanation
(c)
Given, $\frac{x^{2}}{16} + \frac{y^{2}}{9} = 1$
Sum of the focal distance $= 2a = 2 \times 4 = 8$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.