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Black Book Advanced Problems in MathematicsMathematicsApplication of Derivatives

Let f(x) = x + ax + b . Then f(x) = 0 has :

Options

  1. Aonly one real root which is positive if a > 1, b < 0
  2. Bonly one real root which is negative if a > 1, b > 0
  3. Conly one real root which is negative if a < -1, b < 0
  4. Donly one real root which is positive if a < -1, b < 0

Correct answer

A. only one real root which is positive if a > 1, b < 0

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