Teacher2Teacher 
Q&A #104 
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From: Carole To: Teacher2Teacher Public Discussion Date: 2005033013:13:53 Subject: Re: Re: trinomials This trinomial can be factored by grouping. AC = 1575. Prime factors of 1575 are 3*3*5*5*7. Since we're looking for 2 factors of 1575 which sum to 88, choose 63 (3*3*7) and 25 (5*5). Rewrite the trinomial as 35x^2 63x 25x +45 Group the first 2 terms and the last 2 terms and factor a common factor from each group. 7x(5x  9)  5(5x  9) Factor the binomial that is common to both terms (5x  9)(7x  5)
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