You can
put this solution on YOUR website!The area of the box is equal to the product of the two dimensions of the base multiplied by the height.
Looking at your volume expression (x^2+5x+6)(x+5),
The height seems to be (x+5) as this is one-dimensional (a length)
The two-dimensional term (area term) (x^2+5x+6) must be the area of the bootom of the box.
I hope this helps,
Adam
P.S. please visit my website, it may be helpful to you. The address is www.geocities.com/quibowibbler