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      Question

      Find the value x2 + y2, if xy = 13

      and x + y = 7.
      A 20 Correct Answer Incorrect Answer
      B 26 Correct Answer Incorrect Answer
      C 23 Correct Answer Incorrect Answer
      D 30 Correct Answer Incorrect Answer

      Solution

      We know that (x + y)2 = x2 + 2xy + y2 = x2 + y2 = (x + y)2 – 2xy = 72 – 2(13) = 49 – 26 = 23

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