Teacher2Teacher 
Q&A #18119 
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From: Christine <caruso64@comcast.net> To: Teacher2Teacher Public Discussion Date: 2009120723:06:35 Subject: RE: Bottoms up as a method to factor trinomials once you get the two factors of "a times " that add up to "b", you make two fractions, putting each factor over the "a" term. Then you simplify. What is the denominator then becomes the coefficient for the x term and the numerator becomes the constant in each binomial factor of the trinomial. Therefore, you are turning the bottom of the fraction "up" in setting up your factors. Hope this made some sense... it is easier to do visually!
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