# Rationalize the denominator

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• Dec 11th 2007, 12:53 PM
lovely08
Rationalize the denominator
3/9- square root 7
• Dec 11th 2007, 01:47 PM
Krizalid
$\left( {9 - \sqrt 7 } \right)\left( {9 + \sqrt 7 } \right) = 81 - 7 = 74.$

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