JEE Main · 2020 · 05 Sep 2020 · Shift 1 · Ellipse

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If the point on the curve, is farthest from the point then is equal to:
  1. (A)21
  2. (B)48
  3. (C)36✓ Correct
  4. (D)29

Answer: (C)

Solution

Write the curve as and take . Then , and using this reduces to . As a quadratic in on it increases throughout that range, so it is greatest at , giving .

JEE Main · 2020 · 05 Sep 2020 · Shift 1 · Single correct option

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