Answer
$\sqrt[5] ((x+1)^{3})$
Work Step by Step
We know that $a^{\frac{1}{n}}=\sqrt[n] a$ (where n is positive integer greater than 1 and $\sqrt[n] a$ is a real number).
Therefore, $(x+1)^{\frac{3}{5}}=\sqrt[5] ((x+1)^{3})$
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