Chapter 12: Absolute Value Equations and Inequalities: Situation 6 From the MACMTL–CPTM Situations Project
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Published:2015
Shari Reed, AnnaMarie Conner, Sarah Donaldson, Kanita DuCloux, Kelly Edenfield, Erik Jacobson, 2015. "Absolute Value Equations and Inequalities: Situation 6 From the MACMTL–CPTM Situations Project", Mathematical Understanding for Secondary Teaching: A Framework and Classroom-Based Situations, M. Kathleen Heid, Patricia S. Wilson, Glendon W. Blume
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A student teacher began a tenth-grade geometry lesson on solving absolute value equations by reviewing the meaning of absolute value with the class. They discussed that the absolute value represents a distance from 0 on the number line and that the distance cannot be negative. The teacher then asked the class what the absolute value symbol indicates about the equation |x | = 2. A student responded, “anything coming out of it must be 2.” The student teacher stated, “x is the distance of 2 from 0 on the number line.” Then on the board, the student teacher wrote
