Question 853297
let the side of the sheet be x

2 cm cut off from both ends

side of box = (x-4)

height = 2cm. 

Volume of box = base ^2 * height

32= (x-4)^2*2

16= (x-4)^2

take square root
x-4 = 4
x= 8

Side of sheet = 8 cm