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FOIL method

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FOIL method [#permalink] New post 26 Apr 2007, 18:45
Can someone please explain FOIL method for faster solution to problems.

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Tekno9000
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 [#permalink] New post 26 Apr 2007, 20:09
Dude, google is your friend:

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 products and combine any like terms which may occur.



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

= x2 + 7x + 10
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FOIL [#permalink] New post 28 Apr 2007, 04:40
Thankx Neo. I need to learn the reverse. I will rephrase my question. How to find factors of a polynomials using FOIL?
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 [#permalink] New post 28 Apr 2007, 12:45
I just apply the same logic, in reverse order, in my mind. It's easy for your mind to find the factors for almost all GMAT level polys.
  [#permalink] 28 Apr 2007, 12:45
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