Excluded values are the values of the variable that result in a denominator equal to 0, not those that result in a numerator equal to 0. The excluded values here are the solutions to the equations $\displaystyle{{x}}^{{2}}-{25}={0}\usepackage{cmbright}\Huge\$ and $\displaystyle{x}+{5}={0}\usepackage{cmbright}\Huge\$ .