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Black Book Advanced Problems in MathematicsMathematicsQuadratic Equation

The complete set of values of m for which the inequality x^2 - mx - 2 x^2 + mx + 4 > -1 is satisfied x R , is:

Options

  1. Am = 0
  2. B-1 < m < 1
  3. C-2 < m < 2
  4. D-4 < m < 4 .

Correct answer

D. -4 < m < 4 .

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