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Black Book Advanced Problems in MathematicsMathematicsQuadratic Equation

For real numbers x and y, if x^2 + xy - y^2 + 2x - y + 1 = 0 , then :

Options

  1. Ay can not be between 0 and 8 5
  2. By can not be between - 8 5 and 8 5
  3. Cy can not be between - 8 5 and 0
  4. Dy can not be between - 16 5 and 0 .

Correct answer

C. y can not be between - 8 5 and 0

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