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# what do you do when you have a number on the outside of a cubes root or squared root?

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what do you do when you have a number on the outside of a cubes root or squared root?

Guest Sep 12, 2017
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Remember that      $$\sqrt[a]{b}\,=\,b^{\frac1a}$$    .

Here's some examples:

$$\sqrt[3]8=8^{\frac13}=2 \\~\\ \sqrt[2]{25}=25^{\frac12}=5 \\~\\ \sqrt[2]{45^2}=(45^2)^{\frac12}=45^\frac22=45^1=45$$