Answer
$-\infty$
Work Step by Step
$$\lim _{x\rightarrow -\infty }\left( -3x^{16}+2\right) =x^{16}\left( -3+\dfrac {2}{x^{16}}\right) =x^{16}\left( -3+0\right) =-3x^{16}=-\infty $$
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