Find $f^{(n)}(x)$ for $f(x) = 5x^4-8x^3+6x^2-1$

I'm a bit lost and how I would go about creating a general formula for differentiating this equation. Find $f^{(n)}(x)$ for $$f(x) = 5x^4-8x^3+6x^2-1.$$

-
Is it $f(x)\cdots f(x)$ or $(f\circ\ldots\circ f)(x)$ or $f^{(n)}(x)$? I guess that's the latter now that I see you mention differentiation. Denoting the $n$-th derivative $f^n$ is very confusing and uncommon, I think. –  1015 Apr 10 '13 at 3:26
You can use the general formula in this problem. –  Mhenni Benghorbal Apr 10 '13 at 3:29