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Black Book Advanced Problems in MathematicsMathematicsQuadratic Equation

Let f(x) = a^x - x a, a > 1 . Then the complete set of real values of x for which f'(x) > 0 is :

Options

  1. A(1, )
  2. B(-1, )
  3. C(0, )
  4. D(0, 1) .

Correct answer

C. (0, )

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