4 \ \frac{x^2-3x-4}{x^2-x-12}=\frac{(x+1)(x-4)}{(x+3)(x-4)}\\
lim \ x->4 \ \frac{x+1}{x+3} = \frac{5}{7}" alt="lim \ x->4 \ \frac{x^2-3x-4}{x^2-x-12}=\frac{(x+1)(x-4)}{(x+3)(x-4)}\\
lim \ x->4 \ \frac{x+1}{x+3} = \frac{5}{7}" align="absmiddle" class="latex-formula">