Resolução:
$\; \sqrt[\large 3]{8a^{\large 4}}\,=\,\sqrt[\large 3]{8\,\centerdot\,a^{\large 3}\,\centerdot\,a}\,$ $=\,\sqrt[\large 3]{8}\,\centerdot\,\sqrt[\large 3]{a^{\large 3}}\centerdot\,\sqrt[\large 3]{a}\,=\,2\,\centerdot\,a\,\centerdot\,\sqrt[\large 3]{a}\;$
Resposta: