Finding the Domain and Range

We cannot evaluate the function at $\mathrm{-1}$ because division by zero is undefined. The domain is $\left(-\infty ,\mathrm{-1}\right)\cup \left(\mathrm{-1},\infty \right).$ Because the function is never zero, we exclude 0 from the range. The range is $\left(-\infty ,0\right)\cup \left(0,\infty \right).$