Answer
$2b^{5/3}$
Work Step by Step
$\sqrt[3]{8b^{5}}$=$\sqrt[3]{2^{3}\cdot b^{5}}$
$=2\sqrt[3]{b^{5}} \quad $... apply $\ \ \sqrt[n]{a^{m}}=a^{m/n},$
= $2b^{5/3}$
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