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Tool: A Geometric Investigation of (A+B)^2
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Go to: http://illuminations.nctm.org/tools/tool_detail.aspx?id=19 (opens a new window)
Description: Explores a geometric explanation of why (A + B)^2 = A^2 + 2AB + B^2.
Technology Type: Java Applet 
Guide: User's Guide (opens a new window)
Author: NCTM: Illuminations
Language: English 
Cost: Does not require payment for use

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Courses: Math 7 Squaring binomials
Algebra Squaring Binomials