Trinomial Factoring – nice site and last detail
September 28, 2007 am30 6:09 am
- History. I learned breaking the middle from Steve Conrad at an Association of Mathematics Teachers of New York State event five years ago. I’m guessing it was the Fall conference in Syracuse, but I might have the year wrong.
- Most people hunt for factors of Π. Instead, we use numbers that add to Σ. Much simpler: if the product is too large, spread the numbers out, if it is too small, move them together. If you miss the target when passing up or down one number, your expression is non-factorable
- For negative Σ, look for numbers with that difference.
- And here is a wonderful demo of breaking the middle from a private Wisconsin Resource center (can be purchased for off-line use – ignore the FOIL part): Wisconsin Demo.
Click that demo a bunch of times.