# Question #650bf

${\lim}_{x \rightarrow - \infty} - 2 {x}^{4} + 3 {x}^{3} - 1 = - \infty$
As $x \rightarrow - \infty$, $- 2 {x}^{4}$ is negative and $3 {x}^{3}$ is also negative.
So as $x \rightarrow - \infty$, we are adding two negative numbers and subtracting a positive number. This means that $y \rightarrow - \infty$ as well.