How to find the domain of a rational function with radical

The video tutorial explains the importance of focusing on the denominator when dealing with functions, especially when the numerator has an unrestricted domain. It discusses domain restrictions, particularly when the denominator involves a square root, and emphasizes that the denominator should not be equal to zero. The tutorial also covers solving quadratic inequalities and graphing functions, highlighting when functions become undefined.

Explain why we do not want the denominator to equal zero in a function.

How does the quadratic formula relate to the values of X in this context?