What is the complexity class for each one of the following functions What is the complexity class for each one of the following functions:
$a) (n^3+n^2 \log n)(\log n+1) + (10 \log n+7)(n^3+3)$
$b) (2n + n^2)(4n^3 + 4n)$
$c) (n^n + n2^n + 3n)(n! + 6n)$

If your question mean is "what is the complexity of these functions":
a) $O(n^3\log n) \rightarrow a\in P$ 
b) $O(n^5) \rightarrow b\in P$
c) $O(n^nn!) \rightarrow c\in EXP$
