Question 638268
Let x be the width of the rectangle. We are given that 2x+8 is the length of the rectangle. As the area is 960 cm^2 we have that:

x(2x+8)=960

2x^2+8x=960

x^2+4x-480=0

(x-20)(x+24)=0

x=20, x=-24

So we must select x=20 as the width of the rectangle with 2x+8=48 as the rectangle length.