Incorrect. Substitute the values $\displaystyle{a}={1}\usepackage{cmbright}\Huge\$ , $\displaystyle{b}={0}\usepackage{cmbright}\Huge\$ , and $\displaystyle{c}=-{25}\usepackage{cmbright}\Huge\$ into the quadratic formula: $\displaystyle{x}=\frac{{-{b}\pm\sqrt{{{{b}}^{{2}}-{4}{a}{c}}}}}{{{2}{a}}}=\frac{{-{0}\pm\sqrt{{{{0}}^{{2}}-{4}{\left({1}\right)}{\left(-{25}\right)}}}}}{{{2}{\left({1}\right)}}}\usepackage{cmbright}\Huge\$ . If you simplify this expression, what value do you get for x? Can you solve this equation without using the quadratic formula?