what is the volume?

Question

a rectangular box is to be made from a 15 by 40 piece of sheet metal by cutting identical squares from each corner and folding up the sides. Assume that each side of each square cut from each corner measures x inches. Write the volume of the resulting box as a function of x

Answer 1

Draw and label a diagram!

V(x) = x(15 - 2x)(40 - 2x)