Determining the domain of a radical function

The video tutorial explains how to determine the domain of a function involving a radical expression. It covers solving inequalities, emphasizing the importance of flipping the sign when dividing by a negative number. The instructor uses a number line to illustrate the domain, showing that values of X must be less than 2/3. Examples are provided to verify the domain, demonstrating that numbers greater than 2/3 are not included.

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