Are you saying it's equal to.........
An open rectangular tank of height h metres with a square base of side x metres is to be constructed so that it has a capacity of 500 cubic metres. Prove that the surface area of the four walls and the base will be
2000 + x2 (the 2 is squared)
square metres. Find the value of x for this expression to be a minimum.
i have no idea where to even start on this one.