A box without a top is made from a rectangular piece of cardboard, with dimensions 6 ft by 8 ft, by cutting out square corners with side length x.
Which expression can be used to determine the greatest possible volume of the cardboard box?
(8x−6)(6x−8)
(8−2x)(6−2x)x
(6−x)(8−x)x
(8−6x)(6−8x)
