+1223 question reposted: JD is repainting some of the walls in the classrooms at Golder. One wall has a width that is 4 feet less than its length. The wall has an area of 140 square feet. What is the length of the wall?
Let the length be L. We can write an equation for the area:
L(L - 4) = 140
L^2 - 4L - 140 = 0
(L - 14)(L + 10) = 0
L = 14 or L = -10
Length can't be negative, so the wall's length is 14 feet.
