Q. Length of major axis of ellipse $9x^{2} + 7y^{2} = 63$ is
A) 3
B) 9
C) 6
D) $2\sqrt{7}$
Explanation
(c)
Given, $\frac{x^{2}}{7} + \frac{y^{2}}{9} = 1$
Here, $a^{2}\ = 7,\ \ b^{2} = 9\$
Since, $a < b$
Length of major axis $= 2b = 6$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.