1. There are three real numbers $x$ that are not in the domain of $$f(x) = \frac{1}{1+\frac{1}{1+\frac 1x}}.$$ What is the sum of those three numbers?

2.Let \[f(x) = \frac{3x - 7}{x + 1}.\] Find the domain of $f$. Give your answer as an interval.

Guest Mar 14, 2018