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Black Book Advanced Problems in MathematicsMathematicsApplication of Derivatives

Let f(x) = x^3 + 6x^2 + ax + 2 , if (-3, -1) is the largest possible interval for which f(x) is decreasing function, then a =

Options

  1. A3
  2. B9
  3. C-2
  4. D1

Correct answer

B. 9

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