A box with an open top is to be constructed from a rectangular piece of cardboard with dimensions 18 in. by 30 in. by cutting out equal squares of side x at each corner and then folding up the sides as in the figure. Express the volume V of the box as a function of x.

Answer 1

nevermind i figured this one out. the answer I got for this one is x(18-2x)(30-2x).

Answer 2

540

Answer 3

4x^3 -96x^2+540x