Incorrect. Notice that the first two terms $\displaystyle{\left({{x}}^{{2}}-{4}{x}\right)}\usepackage{cmbright}\Huge\$ share a common factor of x. What common factor do the terms in $\displaystyle{9}{x}-{36}\usepackage{cmbright}\Huge\$ share? Find the common factor, and then use the distributive property to factor the expression.