SOLUTION: show how to make a cardboard model to demonstrate that a^2-b^2=(a+b)(a-b)

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Question 1169045: show how to make a cardboard model to demonstrate that
a^2-b^2=(a+b)(a-b)
Answer by josgarithmetic(39838) About Me  (Show Source):
You can put this solution on YOUR website!
Pick a quantity to call "a". Pick a different, smaller quantity and call it "b". Form a carboard rectangle of length a+b and of width a-b. This rectangle is of area (a+b)(a-b). You can identify some sections of this rectangle and their corresponding areas. Sum them. What do you find?