Incorrect. Since $\displaystyle{4}={{2}}^{{2}},{{\left({{4}}^{{-{{5}}}}{{2}}^{{8}}\right)}}^{{-{{2}}}}={{\left({{\left({{2}}^{{2}}\right)}}^{{-{{5}}}}{{2}}^{{8}}\right)}}^{{-{{2}}}}\usepackage{cmbright}\Huge\$ . Does this help you simplify the expression?