Correct. $\displaystyle{{x}}^{{2}}+{14}{x}+{49}={\left({x}+{7}\right)}{\left({x}+{7}\right)}={{\left({x}+{7}\right)}}^{{2}}\usepackage{cmbright}\Huge\$ . To find c, divide b by 2 and square the quotient. $\displaystyle{b}={14}\usepackage{cmbright}\Huge\$ , so $\displaystyle{c}={{\left(\frac{{b}}{{2}}\right)}}^{{2}}={49}\usepackage{cmbright}\Huge\$ .