Incorrect. Applying the quadratic formula using $\displaystyle{a}={5},{b}=-{7}\usepackage{cmbright}\Huge\$ , and $\displaystyle{c}=-{1}\usepackage{cmbright}\Huge\$ gives $\displaystyle{x}=\frac{{-{\left(-{7}\right)}\pm\sqrt{{{{\left(-{7}\right)}}^{{2}}-{4}{\left({5}\right)}{\left(-{1}\right)}}}}}{{{2}{\left({5}\right)}}}\usepackage{cmbright}\Huge\$ . Simplify to arrive at your possible solution(s).