Composition of a quadratic function to a square root function

The video tutorial covers the importance of completing investigations to prepare for problems, focusing on evaluating functions with various inputs. It progresses to plugging expressions into functions and simplifying them, followed by an exploration of function composition. The tutorial concludes with an advanced analysis of function graphs, including finding X intercepts and understanding domains.

What are the X intercepts of the function X^2 - 2, and how can they be found?

Discuss the domain of the function X^2 - 2 based on the analysis provided.