Ok... Well, i might not even know how to do this problem, although i will give it a shot. I know the idea of what you have to do.
Here the objective is to factor this. This is what i shall attempt to do, you know that one of the roots is 1, so you plug that in automatically. I well get back to this post, and edit it, if i manage to factor this cubic -.- if i dont edit it, i didn't get it, and your on your own