Your Plan is Foiled

foiledplan

I normally prefer the phrase “by using the distributive law” instead of the more colloquial “by FOIL,” but I’ll make an exception in this case.

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  1. In the olden days we called it “expand the brackets. It made sense. The popular explanation of the distributive law is very bad, see my post on this:
    https://howardat58.wordpress.com/2015/01/21/more-bad-language-in-math/

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