Answer
$-\infty$
Work Step by Step
$\lim _{x\rightarrow -\infty }\left( 3x^{7}+x^{2}\right) =x^{7}\left( 3+\dfrac {1}{x^{5}}\right) =x^{7}\left( 3+0\right) =x^{7}=-\infty $
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