Respostas

2014-04-03T23:35:11-03:00
Muito simples!
\lim\limits_{x \to 6} \frac{x-6}{x^2-4x-12}
Fatorando x²-4x-12:
\lim\limits_{x \to6} \frac{x-6}{(x+2)(x-6)}
\lim\limits_{x \to 6} \frac{1}{x+2} = \frac{1}{6+2} = \frac{1}{8}