## Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

$4$
Using the definition of rational exponents which is given by $a^{\frac{m}{n}}=\sqrt[n]{a^m}=\left(\sqrt[n]{a}\right)^m,$ the given expression, $8^{2/3} ,$ is equivalent to \begin{array}{l}\require{cancel} \left( \sqrt[3]{8} \right)^2 \\\\= \left( 2 \right)^2 \\\\= 4 .\end{array}