Question

Find the perimeter of a rectangle with a length of (attachment 1) and a width of(attachment 2) .

Answer 1

$P_{\fbox{ }}=2w+2l\\\\w=x^2+2x+7;\ l=-2x+8\\\\P_{\fbox{ }}=2(x^2+2x+7)+2(-2x+8)=2x^2+4x+14-4x+16\\\\\boxed{P_{\fbox{ }}=2x^2+30}$