(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I am confused with this equation I found online... It seems wrong to me, I need help.

My question is,why did the person who worked taht equation use a x^2 to rationalize the equation when the actual equation was an x^3??

http://tutorial.math.lamar.edu/Classes/Alg/Radicals_files/eq0081MP.gif

2. Relevant equations

3. The attempt at a solution

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# Homework Help: Rationalizing the denominator

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