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5 November, 09:47

If a+b = 7, and a² + b²=25

then ab = ?

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  1. 5 November, 10:08
    0
    a2+b2=25

    or, (a+b) ^2-2ab=25

    or, (7) ^2-2ab=25 [a+b=7]

    or, 49-25=2ab

    or, 24/2=an

    •°• ab=12 ...
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