A closed box has a square base with side length l feet and height h feet. Given that the volume of the box is 35 cubic feet, express the surface area of the box in terms of l only. ??
So we are told that the box has a square base, so all four sides are the same length I.
Volume = Length x Breadth x Height
So we know that Length and Breadth are both equal to I. Hence
Now we need to calculate the surface are of the box. There are four side faces with area