You may have correctly multiplied the first fraction by $\displaystyle\frac{{{x}+{2}}}{{{x}+{2}}}\usepackage{cmbright}\Huge\$ and the second by $\displaystyle\frac{{{x}+{5}}}{{{x}+{5}}}\usepackage{cmbright}\Huge\$ , but then simplified the numerators incorrectly. You need to use the distributive property when simplifying $\displaystyle{8}{\left({x}+{2}\right)}\usepackage{cmbright}\Huge\$ and $\displaystyle{3}{\left({x}+{5}\right)}\usepackage{cmbright}\Huge\$ . The correct answer is: $\displaystyle\frac{{{5}{x}+{1}}}{{{{x}}^{{2}}+{7}{x}+{10}}}\usepackage{cmbright}\Huge\$