Answer
$\sqrt[7]{(2x+1)^2}$
Work Step by Step
Keep in mind that the index is the denominator of the exponent.
Some examples such as this will be easier to simplify into the form, $\sqrt[n] {a^m}$
$(2x+1)^{2/7}$
$\sqrt[7]{(2x+1)^2}$
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