Question 981806
width=x
length=3x-2
area is product and is 40 in^2

x*(3x-2)=40
3x^2-2x=40
3x^2-2x-40=0
(3x+10)(x-4)=0
only the root x=4 makes sense.

width is 4 in
length is 10 in
area is 40 in^2.