Question

    If (a + b) = 7 and ab = 9, then find the value of (a2 + 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 = 72 Or, a2 + b2 + 2ab = 49 Or, a+ b2 + 18 = 49 So, a2 + b2 = 49 - 18 = 31

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