The function f(x)=501170(0.98)x gives the population of a Texas City x years after 1995. What was the population in 1995?
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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.