Question 767049
width = x
length = 7 + 2x
Area = length * width
4 = (7 + 2x) * x
4 = 7x + 2x^2
2x^2 + 7x - 4 + 0
(2x - 1)(x + 4) = 0
x + 4 = 0
x = - 4 (No answer x<0)
2x - 1 = 0
2x = 1
 x = 1/2
Width = 1/2 units
Length = 8 units.
Hope this helps.
:-)