## Algebra and Trigonometry 10th Edition

(a) Impossible: the denominator can not be equal to $0$. (b) $0$
$\frac{x+1}{x-1}$ (a) $\frac{1+1}{1-1}=\frac{2}{0}$. Impossible: the denominator can not be equal to $0$. (b) $\frac{-1+1}{-1-1}=\frac{0}{-2}=0$