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23 May, 05:38

If a+b = 7, and a² + b²=25

then ab = ?

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Answers (1)
  1. 23 May, 06:49
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    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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