Lim -{n^3} + 2n + 4} bằng

Chọn A

Ta có \(\mathop {\lim }\limits_{n \to + \infty } \left( { - {n^3} + 2n + 4} \right) = \mathop {\lim }\limits_{n \to + \infty } {n^3}.\mathop {\lim }\limits_{n \to + \infty } \left( { - 1 + \frac{2}{{{n^2}}} + \frac{4}{{{n^3}}}} \right) = - \infty \).