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    Question

    If (a + b) = 9 and (a2 + b2) =

    53, then find the value of (a ├Ч b).
    A 12 Correct Answer Incorrect Answer
    B 14 Correct Answer Incorrect Answer
    C 10 Correct Answer Incorrect Answer
    D 8 Correct Answer Incorrect Answer

    Solution

    (a + b) = 9 Squaring on both sides, we get, a2 + b2 + 2ab = 81 Or, 53 + 2ab = 81 Or, 2ab = 81 тАУ 53 = 28 Or, ab = 28/2 = 14

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