Question 715224
Area of rectangle = l*w

Width be x
Length = x+3

x(x+3) =40

x^2+3x=40
x^2+3x-40=0

x^2+8x-5x-40=0

x(x+8)-5(x+8)=0

(x+8)(x-5)=0

Therefore x= -8 OR x=5

Ignore negative

x=5 is the width

width = 5 feet


Length = x+3----> 8feet