Math Tools Discussion: All Topics, Factoring Quadratics

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Topic: Factoring Quadratics

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I invite you to look at this scheme for factoring a quadratic with a=1.
http://www.youtube.com/watch?v=dErV6986a0Q

I also would like to know whether you truly believe that teaching factoring
except (perhaps) when a=1 is a worthwhile use of our time as teachers:
http://www.mathcasts.org/janita/?p=43

If we didn't spend so much time teaching factoring techniques, we might have
time to explore things like:
http://mathcasts.org/gg/student/quadratics/motion/motion_v3.html

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