1/5-0.2
(x - 1)(x^2 + x + 1)
It is not clear what you mean by x^2 minus "factor x". Please add more information and resubmit.
(x + 1)(x - 1)
(x + 2)(x - 4)
(x + 2)(x - 9)
(x - 5)(x + 3)
x(x + 3)(x - 4)
(x + 1)(x - 8)
x(x-1)
(x - 2)(2x + 3)
x cubed minus 216