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Black Book Advanced Problems in MathematicsMathematicsApplication of Derivatives

f(x) = cases 3 + |x - k| & , x k a^2 - 2 + (x - k) (x - k) & , x > k cases has minimum at x = k , then :

Options

  1. Aa R
  2. B|a| < 2
  3. C|a| > 2
  4. D1 < |a| < 2

Correct answer

C. |a| > 2

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