How to subtract two linear functions then determine the domain

The video tutorial emphasizes the importance of using parentheses in mathematical expressions, particularly in subtraction. It explains how failing to use parentheses can lead to incorrect results, using examples to illustrate the point. The tutorial also covers the process of combining like terms and rewriting expressions in descending order. Additionally, it discusses the domain of functions, highlighting that the domain remains all real numbers when subtracting functions, due to the understanding of parent functions.

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