Question 666142
w = l-2

l * l-2 = 120

l^2 - 2l = 120

l^2 - 2l -120 = 0

(l-12)(l+10) = 0

l = 12 l =-10

Length can't be negative so l = 12.

Then w = 12 -2 = 10

12 x 10.