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    • Question

      If x and y satisfy x² + y² = 25 and x + y = 7, find

      xy.
      A (4,3) Correct Answer Incorrect Answer
      B (2,5) Correct Answer Incorrect Answer
      C (7,4) Correct Answer Incorrect Answer
      D None of these Correct Answer Incorrect Answer

      Solution

      ATQ, (x + y)² = x² + y² + 2xy → 49 = 25 + 2xy → xy = 12. Roots possible: (3,4) or (4,3).

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