Question 278296
Let the width be x

length = x+8

x(x+8) =240
x^2+8x=240

x^2+8x-240=0

x^2 +20x-12x-240=0

x(x+20)-12(x+20)=0

(x+20)(x-12)=0

x=-20 0r 12

12, and 20