From: Paul DeSantis <pauldesantis4@verizon.net>
To: Teacher2Teacher Public Discussion
Date: 2009012210:43:27
Subject: Re: Re: trinomials


Factoring 35x^2 - 88x + 45:
ac =(35)(45)=1575.
Factors of 1575 that add to -88 are -63 and -25.
Rewrite trinomial as 35x^2 - 63x - 25x + 45.
Group as (35x^2 - 63x) - (25x - 45).
Factor GCF from each group  7x(5x - 9) - 5(5x - 9).
Factor GCF again   (5x - 9)(7x - 5).

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