width and length 7

Question

The area of a rectangular wall of a barn is
42
square feet. Its length is
8
feet longer than twice its width. Find the length and width of the wall of the barn.



width =


Length=

Answer 1

w=w

l=2w+8

A=lw

42=w(2w+8)

42=2w^2+8w

2w^2+8w-42=0

w^2+4w-21=0

(w+7)(w-3)=0

w-3=0

w=3 feet

l=2*3+8=14 feet