Question

\(\mathop {\lim }\limits_{x \to 3} \frac{{{x^2} - 9}}{{x - 3}}\) bằng:

A. 0.                                            

B. 6.                                            

C. 3.                                             

D. 1.

Answer 1

\(\mathop {\lim }\limits_{x \to 3} \frac{{{x^2} - 9}}{{x - 3}} = \mathop {\lim }\limits_{x \to 3} \frac{{\left( {x - 3} \right)\left( {x + 3} \right)}}{{x - 3}} = \mathop {\lim }\limits_{x \to 3} \left( {x + 3} \right) = 3 + 3 = 6\)

Chọn B.