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NTA Abhyas JEE Main2020MathematicsFunctionsPractice

Let f : 6,8 → 9,11 be a function defined as f x = x + x 2 (where, . denotes the greatest integer function), then f - 1 x is equal to

Options

  1. Ax - x 2
  2. B– x - 3
  3. Cx - 3
  4. D1 x + x 2

Correct answer

C. x - 3

Step-by-step solution

Since f : 6,8 → 9,11 ∴ f x = x + 3 ∴ f - 1 x = x - 3

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