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Topic: stop teaching shifting & stretching?
Replies: 14   Last Post: Oct 19, 1998 8:58 AM

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Victor Levine

Posts: 50
Registered: 12/6/04
Re: stop teaching shifting & stretching?
Posted: Oct 14, 1998 8:05 AM
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At 08:49 PM 10/12/1998 -0400, you wrote:
>>Since my calculus students will have graphers, is it the
>>consensus that I should stop teaching my precalculus
>>students such tricks to aide graphing as shifting & stretching
>>functions and symmetry? I'd love to stop teaching this, because it
>>would free time for other "essential" topics, which I do not
>>get to.
>>Bill Larson

I think that it is important to keep teaching these ideas. I agree with
several others that the calculator is an aid to instruction, but it is not
a replacement for teaching. I spend a lot of time asking my students "why
does it look like this?" since they are so willing to believe that the
calculator is always correct, regardless of what they have typed in for the
function. Since most AB teachers are getting close to, or have started
derivatives, at this time, explaining why the TI-8X calculators indicate
that the derivative of abs(x) is 0 at x = 0 is a great tool for realizing
that the students have to be smarter than their calculators!
Vic Levine
Madison Memorial High School
201 S. Gammon Road
Madison, WI 53717-1499
FAX 608.271.2927

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