Suppose that $$f(x) = (3+x)^{9} (3-x)(6 - x).$$ Evaluate the following limits. Enter I for $\infty$, -I for $-\infty$, and DNE if the limit does not exist.

$\displaystyle{\lim_{x\rightarrow \infty} f(x)}$ =

$\displaystyle{\lim_{x\rightarrow -\infty} f(x)}$ =