Incorrect. Remember that $\displaystyle{{7}}^{{x}}{{7}}^{{y}}={{7}}^{{{x}+{y}}}\usepackage{cmbright}\Huge\$ , and $\displaystyle{{\left({{7}}^{{a}}\right)}}^{{b}}={{7}}^{{{a}{b}}}\usepackage{cmbright}\Huge\$ , and $\displaystyle{{7}}^{{-{{a}}}}=\frac{{1}}{{{7}}^{{a}}}\usepackage{cmbright}\Huge\$ . Simplify the expression within the parentheses first, then address the exponent $\displaystyle{3}\usepackage{cmbright}\Huge\$ , and then divide by $\displaystyle{{7}}^{{-{{5}}}}\usepackage{cmbright}\Huge\$ .