Posted by lisa on Thursday, July 5, 2012 at 8:15pm.
Salman Khan does his usual excellent work here
http://www.youtube.com/watch?v=nOZTe8jU2g4
for x^2 + bx +c , and
http://www.khanacademy.org/math/algebra/polynomials/v/factoring-trinomials-with-a-non-1-leading-coefficient-by-grouping
for ax^2 + bx + c
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