Incorrect. Think of the equation as $\displaystyle{{a}}^{{2}}-{2}{a}{b}+{{b}}^{{2}}\usepackage{cmbright}\Huge\$ , which is equal to $\displaystyle{\left({a}-{b}\right)}{\left({a}-{b}\right)}\usepackage{cmbright}\Huge\$ . Which values for a and b will yield the expression $\displaystyle{36}{{x}}^{{2}}-{84}{x}+{49}\usepackage{cmbright}\Huge\$ ? Use that information to solve the problem.