Giới hạn lim 2{x^2} + x - 6/ x^2} - 4 bằng bao nhiêu?

Chọn C

Ta có \(\mathop {\lim }\limits_{x \to - 2} \frac{{2{x^2} + x - 6}}{{{x^2} - 4}} = \mathop {\lim }\limits_{x \to - 2} \frac{{\left( {2x - 3} \right)\left( {x + 2} \right)}}{{\left( {x - 2} \right)\left( {x + 2} \right)}} = \mathop {\lim }\limits_{x \to - 2} \frac{{2x - 3}}{{x - 2}} = \frac{7}{4}\).