Answer :
[tex]{ \large{ \sf{ \implies{(8 {}^{ \frac{2}{3} }) {}^{4} }}}}[/tex]
[tex]{ \large{ \sf{ \implies( \sqrt[3]{8} {}^{2} ) {}^{4} }}}[/tex]
[tex]{ \large{ \sf{ \implies{{(2 {}^{2} ) {}^{4} }}}}}[/tex]
[tex]{ \large{ \implies{ \sf{4 {}^{4} }}}}[/tex]
[tex]{ \large{ \therefore{ \sf{256} \: \: ans.}}}[/tex]