Having defined addition and multiplication for matrices, we describe the laws of matrix algebra. These are very similar to the usual laws of algebra with one important exception: matrix multiplication is NOT commutative.

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Three absolute value inequality example problems. The problems are carefully set up and explained, including how to think about the problems logically and how to graph the solutions. From the Precalculus course by Derek Owens. More info about this course can be found at http://www.DerekOwens.com and http://www.LucidEducation.com

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