Question 1067236
W=x
L=2x+10
A=(2x+10)*x=2x^2+10x=672
2x^2+10x-672=0
x^2+5x-336=0
(x+21)(x-16)=0
x=16 inches width
2x+10=42 inches length.
That area is 672 in^2.