Leah has 2/5 of a gallon of paint. She decides to use 1/4 of this paint to paint a door. What fraction of a gallon of paint does
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and is all you can simplify from it.
so... all we did, was rationaliize it, namely, "getting rid of the pesky radical at the bottom", we do so by simply multiplying it by something that will raise the radicand, to the same degree as the root, thus the radicand comes out.