Let the length of a latus rectum of an ellipse be 10 . If its eccentricity is the minimum value of the function , , then is equal to :
- (A)125
- (B)126✓ Correct
- (C)120
- (D)115
Answer: (B)
Solution
For the latus rectum is , so . The quadratic has its minimum at , where , so . From comes , giving . Equating with gives and . Therefore .
JEE Main · 2025 · 07 Apr 2025 · Shift 2 · Single correct option