How to add two functions reciprocal functions and find the domain

The video tutorial covers the addition of functions using different notations, emphasizing the importance of common denominators when combining functions. It explains how to find common denominators for binomial expressions and simplifies expressions using these denominators. The tutorial concludes with determining the domain of a function, highlighting the need to factor denominators to avoid zero values.

Why is it helpful to leave the denominator factored when finding the domain?

What is the domain of the function when combining X and X - 2?