Math

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How do we rewrite 7/a - 9/b so that both terms have the denominator ab?

  • Math -

    7 / a Multiply Numerator and Denominator by b

    7 / a = 7 b / a b

    9 / b Multiply Numerator and Denominator by a

    9 / b = 9 a / a b


    7 / a - 9 / b = 7 b / a b - 9 a / a b =

    ( 7 b - 9 a ) / a b

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