Incorrect. Set the width of the border to x. Find the area of the blanket (with border) by multiplying its width $\displaystyle{\left({6}+{2}{x}\right)}\usepackage{cmbright}\Huge\$ by its height $\displaystyle{\left({5}+{2}{x}\right)}\usepackage{cmbright}\Huge\$ . Now set the area of the border, 12 square feet, equal to the difference of the blanket (with border) and the area of the blanket without border $\displaystyle{\left({5}\cdot{6}\right)}\usepackage{cmbright}\Huge\$ . Then simplify your expression to find your trinomial.