JEE Advanced · 2013 · 02 Jun 2013 · Paper 2 · Differential Equations

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Let (the set of all real numbers) be a function. Suppose the function is twice differentiable, and satisfies .

Which of the following is true for ?
  1. (A)
  2. (B)
  3. (C)
  4. (D)✓ Correct

Answer: (D)

Solution

Let for .

Then and



So for all , meaning is strictly convex.

Since and , and is strictly convex, we have:

for all

Therefore , which gives for .

Since there's no lower bound specified, we have .

JEE Advanced · 2013 · 02 Jun 2013 · Paper 2 · Single correct option

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