Subtract two rational expressions and determine excluded values

The video tutorial covers the process of factoring trinomials, identifying common denominators, and simplifying expressions. It begins with an introduction to trinomial factoring, followed by strategies to find factors. The tutorial then explains how to find and use common denominators in expressions. It also discusses simplifying expressions using the distributive property and highlights the importance of considering excluded values. The video concludes with a correction of a previous error, emphasizing the need for accuracy in mathematical operations.

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