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Discussion :: Simplification

  1. If a - b = 3 and a2 + b2 = 29, find the value of ab.
    2. A.

    10
    B.

    12
    C.

    15
    D.

    18

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    Answer : Option A

    Explanation :

    2ab = (a2 + b2) - (a - b)2

       = 29 - 9 = 20

       ab = 10.

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