Question 825846
The area of a rectangle is length*width
Given: width = x, length, l = x+4
The area = x*(x+4) = 45
x^2+4x-45 = 0
This can be factored as (x-5)(x+9) = 0
Taking the positive solution, we have x = 5
Therefore, the length = 5+4 = 9 ft.