Domain of Rational Radical Function

The video tutorial explains how to determine domain restrictions for functions involving rational expressions and square roots. It covers identifying values that make the denominator zero and ensuring the expression under a square root is non-negative. The instructor corrects a mistake in the calculation and emphasizes the importance of verifying solutions. The domain is expressed using intervals and union symbols, with a focus on understanding open and closed intervals.

What is the significance of the number line in determining the domain?

Describe the process of finding the domain of the function mentioned in the text.