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  • 5 years ago

what is foil??

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  1. anonymous
    • 5 years ago
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    it is a way of helping you to remember how to expand a binomial. it stands for first, outside, inside and last. example (x + 2)(x - 5) x and x are the 'first' x*x = x^2 x and -5 are the 'outside' x * -5 +2 and x are the 'inside' +2 * x +2 and -5 are the 'last' +2 * -5 adding these results gives the expansion Its just as easy to use the distributive law and first multiply second bracket by and then by +2

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