Incorrect. Rewrite the left side so that it is the square of a binomial: $\displaystyle{{\left({x}+{3}\right)}}^{{2}}={16}\usepackage{cmbright}\Huge\$

Take the square root of both sides, solve for x, and simplify. The correct answer is $\displaystyle-{7}\usepackage{cmbright}\Huge\$ .