Question 547674
let the side of the square sheet be x

1 ft cut from corners
so side = (x-2)

side = (x-2)
height =1

Volume = (x-2)(x-2)*1
4=(x-2)^2
4=x^2-4x+4
x^2-4x=0
x(x-4)=0
x=4 the eheet metal should be 4 by 4 ft