Looking at the first examples above, we can re-write them like this: You can enter fractional exponents on your calculator for evaluation, but you must remember to use parentheses. If you are trying to evaluate, say, 15 (4/5) , you must put parentheses around the " 4/5 ", because otherwise your calculator will think you mean " (15 4 ) ÷ 5 ". For example, what is the result of 3 raised to ½? If you're seeing this message, it means we're having trouble loading external resources on our website. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked. Although square roots are the most common rational roots, we can also find cube roots, 4th roots, 5th roots, and more. Just as the square root function is the inverse of the squaring function, these roots are the inverse of their respective power functions.