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a^2 - b^2 = (a+b)(a-b), Algebraic Formula

a^2 - b^2 = (a+b)(a-b), Algebraic Formula

cults3d

(a+b)(a-b)=a^2-b^2 Models play an important role in algebraic thinking. Here is a geometric model for (a+b)(a-b), requiring almost no word. Yes, (a+b)(a-b)=a^2+ab-ab-b^2. But a picture is appealing, too. You can use all the three pieces or just the board. I do think on needs to talk about it, though.

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