Incorrect. Substitute the values $\displaystyle{a}={7}\usepackage{cmbright}\Huge\$ , $\displaystyle{b}=-{1}\usepackage{cmbright}\Huge\$ , and $\displaystyle{c}={2}\usepackage{cmbright}\Huge\$ into the quadratic formula: $\displaystyle{x}=\frac{{-{b}\pm\sqrt{{{{b}}^{{2}}-{4}{a}{c}}}}}{{{2}{a}}}=\frac{{-{\left(-{1}\right)}\pm\sqrt{{{{\left(-{1}\right)}}^{{2}}-{4}{\left({7}\right)}{\left({2}\right)}}}}}{{{2}{\left({7}\right)}}}\usepackage{cmbright}\Huge\$ . If you simplify this expression, what value do you get for the discriminant? What does this mean about x?