JEE Main · 2025 · 07 Apr 2025 · Shift 2 · Ellipse

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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 :
  1. (A)125
  2. (B)126✓ Correct
  3. (C)120
  4. (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

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