Describe the end behavior of the polynomial function:
$f(x)=-3x^4-3x^3+23x^3-8x^2-x+1$
As $x \rightarrow -\infty$, $f(x) \rightarrow \text{?}$
As $x \rightarrow \infty$, $f(x) \rightarrow \text{?}$
$f(x)=-3x^4-3x^3+23x^3-8x^2-x+1$
As $x \rightarrow -\infty$, $f(x) \rightarrow \text{?}$
As $x \rightarrow \infty$, $f(x) \rightarrow \text{?}$