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      Question

      If (a + b) = 7 and ab = 9, then find the value of

      (a2┬а+ b2).
      A 40 Correct Answer Incorrect Answer
      B 56 Correct Answer Incorrect Answer
      C 34 Correct Answer Incorrect Answer
      D 31 Correct Answer Incorrect Answer

      Solution

      According to the question, (a + b)2┬а= 72 Or, a2┬а+ b2┬а+ 2ab = 49 Or, a2┬а+ b2┬а+ 18 = 49 So, a2┬а+ b2┬а= 49 - 18 = 31

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