Question 384615
let the length cut in the corners be x 
Length of box will be 20-2x
width will be 18-2x
height = x
..
Volume V of the box = (18-2x)(20-2x)*x
V=(360-76x+4x^2)*x
...
{{{(highlight(V=4x^3-76x^2+360x))}}}
...
m.ananth@hotmail.ca