please I need help!!

Thomas needs to buy a cardboard sheet that will allow him to make his 224 in 3 box. To help construct the box, he needs to cut out 2 inch squares from both the lengths and widths on all sides and then fold them up to make a box. Given that the length will need to be 6 inches longer than the width create an equation for the volume of the box, find the zeroes, the dimensions of the box, and graph the function.