SOLUTION: 3 _____ = ? rationalize the denominator. thanks for your help! 2 -sqrt7

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Question 637610: 3
_____ = ? rationalize the denominator. thanks for your help!
2 -sqrt7
Answer by solver91311(24713) About Me  (Show Source):
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Multiply the fraction by 1 in the form of the conjugate of the denominator divided by itself. The conjugate of a binomial is . The product of a binomial and its conjugate is the difference of two squares -- hence the radical in the denominator goes away. And you don't care how ugly the numerator gets.

John

My calculator said it, I believe it, that settles it
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