You can put this solution on YOUR website! So where is your work so far? step by step?
I'll get you started
...........x^3
(x-1)|(x^4 + 5x^3-x^2-3x-1)
...........x^4...-x^3
......................6x^3-x^2
Continue just like in regular long division
There will be a remainder of 1 put that over (x-1)