JEE Main · 2020 · 04 Sep 2020 · Shift 1 · Ellipse

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Let be given ellipse, length of whose latus rectum is 10 . If its eccentricity is the maximum value of the function, , then is equal to:
  1. (A)126✓ Correct
  2. (B)135
  3. (C)116
  4. (D)145

Answer: (A)

Solution

The latus rectum gives . The function takes its greatest value at , so the eccentricity is . From , . Combining with , gives , so and . Hence .

JEE Main · 2020 · 04 Sep 2020 · Shift 1 · Single correct option

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