Correct. Substituting the values $\displaystyle{a}={1},{b}={0},\usepackage{cmbright}\Huge\$ and $\displaystyle{c}=-{25}\usepackage{cmbright}\Huge\$ into the quadratic formula, you found that $\displaystyle{x}={5}\usepackage{cmbright}\Huge\$ or $\displaystyle{x}=-{5}\usepackage{cmbright}\Huge\$ . Notice that this equation can also be factored without using the quadratic formula: $\displaystyle{{x}}^{{2}}-{25}={\left({x}+{5}\right)}{\left({x}-{5}\right)}.\usepackage{cmbright}\Huge\$