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Does is matter if a person do f before the other terms in foil or can a person do it...

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monique06 | Valedictorian

Posted May 10, 2013 at 12:57 AM via web

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Does is matter if a person do f before the other terms in foil or can a person do it any order like ofil or lfio?

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pramodpandey | College Teacher | Valedictorian

Posted May 10, 2013 at 4:08 AM (Answer #1)

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A technique for distributing two binomials . The letters FOIL stand for First, Outer, Inner, Last. First means multiply the terms which occur first in each binomial. Then Outer means multiply the outermost terms in the product. Inner means multiply the innermost two terms. Last means multiply the terms which occur last in each binomial. Then  simplify  the product  and combine any like terrms which may occur.

Example:

(x+3)(x+7)=x.x+x.7+3.x+3.7

                  FF   FO   IF    IL

First   F

O   outer

I    inner

L   last

However it is distributive property only and simplify version.

(x+3)(x+7)=(3+x)(7+x)   but positions remain same First ,outer,inner ,last.

So we can not change IFOL or in any permutations.

 

 

Example: (x + 2)(x + 5) = x·x + x·5 + 2·x + 2·5
                         First Outer Inner  Last

                        = x2 + 7x + 10

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