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completing the square revisited
Posted:
Feb 24, 1998 10:52 PM


Although not directly related to apcalc I would be interested in reactions to the following:
In an alg 2 class we have just gone through the whole process of completing the square (i.e., converting a quadratic function to <<vertex form>>) We then looked at how this same process could be used to find the xintercepts of the quadratic and eventually took a deep breath and plowed through the "derivation" of what you and I fondly know as "The Quadratic Formula". (Not too sure how successful that all was as the algebraic simplifying got a bit heavy for many of the kids). Anyway, we ended up with the statement that:
If ax^2 +bx + c = 0, then x = etc etc..
Here is my question (finally, they groan....): I am insisting that the kids refer to this result as The Quadratic Theorem and when asked for it (yes they do need to memorize it) they are to give me back the ENTIRE sentence above, i.e., "if ....., then......". In some (probably very small) way this might help them to understand that this is a result that we actually proved to be true and is not simply some mishmash of symbols that mean ol' Mr B (no relation to Mrs B...) is telling them to memorize. Thoughts?
thanx for your forbearance
mike bolduan The Catlin Gabel School bolduan@catseq.catlin.edu bolduan@aracnet.com



