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Answer: x³
Explanation:
Note: There is no radical expression, only an exponential expression.
![\sqrt[n]{x^(3n)}=x^{(3n)/(n)}=x^3](https://img.qammunity.org/2020/formulas/mathematics/middle-school/rstvp6n9jopor3edom3w69g8nl0i03kgvh.png)