Rational exponents are exponents that are fractions. We re-write them so that the top number is an exponent and the bottom number is a radical. Then, we simplify both the exponent and the radical to get our answer. Note that order doesn't matter - you can do either the exponent or the radical first and you will get the same answer.
For a video example on how to do this, click here:
http://www.educreations.com/lesson/view/rational-exponents/14387309/?s=CO1gBl&ref=app
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