Evaluating a Composition of Two Functions Rational and Radical

The video tutorial explains the process of function composition, specifically focusing on calculating G of F of X. It begins with an introduction to the concept, followed by a detailed calculation of F of -1. The result is then used in the G of X function, and the expression is simplified using common denominators. The tutorial concludes with the final calculation, resulting in the value 11/6.

Explain the process of simplifying the expression involving common denominators as mentioned in the text.

What is the significance of finding a domain value in the context of this lesson?