Drexel dragonThe Math ForumDonate to the Math Forum



Search All of the Math Forum:

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.


Math Forum » Discussions » Courses » ap-calculus

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

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
LnMcmullin@aol.com

Posts: 10,730
Registered: 12/3/04
Re: stop teaching shifting & stretching?
Posted: Oct 12, 1998 8:34 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

In a message dated 10/12/98 14:22:50 Eastern Daylight Time,
Bill_Larson@compuserve.com writes:

<< 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.
>>

I suggest you continue to teach it. It is a very important idea. I can't
imagine a good pre-calculus course without these topics. It should be covered
somewhere (trig functions make good examples).

Also consider the 1998 AP Exam question AB2/BC2: quite a few students answered
and justified part (d) be using the fact that bxe^(bx) is a stretching (or
shrinking) of the function 2xe^(2x) analyzed earlier in the same problem and
therefore the absolute minimum does not change. (They received full credit of
course -- as well they should)

Lin McMullin
Ballston Spa, NY





Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2014. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.