Help with a math factoring question

The question says:

A) x^3 - x^2 - x + 1

Thank you!

x^3-x-x^2+1
x(x^2-1)-(x^2-1)

(x^2-1)(x-1)
(x-1)(x+1)(x-1)

i have lots of example of this kind of problem factoring polynomials

http://www.youtube.com/playlist?list=PLs…