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anonymous
 5 years ago
what is foil??
anonymous
 5 years ago
what is foil??

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0it 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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