Question 761135
Length = x
Width = x - 4
Area = length * width
x(x - 4) = 45
x^2 - 4x = 45
x^2 - 4x - 45 = 0
(x - 9)(x + 5) = 0
x = -5 (no answer)
x = 9
Length = 9m
Width = 5m
Hope this helps.
:-)