Partial fraction decomposition of a rational function with denominator $x^5+2x^4+x^3-x^2-2x-1$ 
Factorize the denominator completely and write $f(x)$ as a partial fraction given $$f(x) = \frac{2x^5+15x^4+15x^3+2x^2+2}{x^5+2x^4+x^3-x^2-2x-1}$$

Any ideas for this partial fraction question? Not a clue how to go about it, the normal methods Im used to dont work. Any tips for direction will be greatly appreciated
I tried the general methods of breaking down the denominator and placing the parts over A and B, as well as C - the 2 factorizations that I tried using were (x + 1)^2 (x^3 - 1) and (x+1)^2 ( x^2 + x + 1) (x-1). I tried long division of the polynomials as well but for some reason I wasnt able to get it to work. Thanks for the feed back! 

Startup Help
The denominator has a root $x=1$ and $x=-1$ so $$(x-1)(x+1)g(x)=x^5+2x^4+x^3-x^2-2x-1$$
$$(x^2-1)g(x)=x^5+2x^4+x^3-x^2-2x-1$$
Use Long division to find $g(x)$ And factorize further.
