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Black Book Advanced Problems in MathematicsMathematicsQuadratic Equation

Let f(x) = x^2 + bx + c , minimum value of f(x) is -5, then absolute value of the difference of the roots of f(x) is :

Options

  1. A5
  2. B20
  3. C15
  4. DCan't be determined.

Correct answer

B. 20

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