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Black Book Advanced Problems in MathematicsMathematicsApplication of Derivatives

If the cubic polynomial y = ax^3 + bx^2 + cx + d ( a, b, c, d R ) has only one critical point in its entire domain and ac = 2 , then the value of |b| is :

Options

  1. A2
  2. B3
  3. C5
  4. D6

Correct answer

D. 6

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