Explanation:
To change from radical form to exponential form, we will use the following
[tex]\sqrt[a]{x^b}=x^{b/a}[/tex]Then, The fifth root plus x of eighty-one to the third power is equal to
[tex]\sqrt[5+x]{81^3}[/tex]Which can be written as
[tex]81^{\frac{3}{x+5}}[/tex]Answer:
So, the answer is
[tex]81^{\frac{3}{x+5}}[/tex]