Chapter 14.7, Problem 41ES

Use the transformation $u=x,\upsilon =z-y,w=xy$ to find ${\displaystyle \underset{G}{\iiint }{\left(z-y\right)}^{2}xydV}$ where G is the region enclosed by the surfaces $x=1,x=3,z=y+1,xy=2,xy=4.$