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Math Help - Rationalize the denominator

  1. #1
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    Rationalize the denominator

    3/9- square root 7
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  2. #2
    Math Engineering Student
    Krizalid's Avatar
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    \left( {9 - \sqrt 7 } \right)\left( {9 + \sqrt 7 } \right) = 81 - 7 = 74.

    Now, why don't you multiply top & bottom by some nice expression to rationalize the desired?
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