What are like terms and how do I use them? Math Foundations

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Like terms provide one of the simplest equivalences in mathematics. By gluing rectangles together, we can figure out what like terms are and how to use them to simplify mathematical expressions.
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Chapters:
0:00 What are Like Terms?
1:15 The Gluing Theorem
3:15 Like terms with Different Letters
6:46 Gluing Squared Terms
8:10 Like terms with Squares
10:18 Problem | Simplify Terms
12:48 Problem | Without Boxes
14:36 Summary
16:13 End Screen