You wish to pack a cardboard box inside a wooden crate. In order to have room for the packing materials, you need to leave a $0.5 \ \mbox{ft}$ space around the front, back, and sides of the box, and a $1 \ \mbox{ft}$ space around the top and bottom of the box.

If the cardboard box is $x$ feet long, $(x+2)$ feet wide, and $(x-1)$ feet deep, find a formula in terms of $x$ for the amount of packing material, $M$, needed.

$M(x) =$