Date: Oct 24, 2012 11:36 AM
Author: Louis Talman
Subject: Re: [ap-calculus] Double Derivatives
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A number of people have replied to this question, correctly. But I wish

they'd mentioned that their answers reflect an important fact: The meaning

of the sentence, "The test fails," is precisely what they're illustrating.

When we say that a test fails, we mean exactly that the test doesn't give

us *any* useful information about the phenomenon we used the test for.

On Tue, Oct 23, 2012 at 3:12 PM, Debbie Bricker <

DBricker@cathedralcatholic.org> wrote:

>

> NOTE:

> This ap-calculus EDG will be closing in the next few weeks. Please sign

> up for the new AP Calculus

> Teacher Community Forum at

> https://apcommunity.collegeboard.org/getting-started

> and post messages there.

> ----------------------------------------------------------------------------------------------------------------------------

> In using the second derivative test for extrema, you may get the second

> derivative to equal zero when plugging in a critical number and the test

> then fails. Will this point then be a POI?

>

> Debbie

>

> To search the list archives for previous posts go to

> http://lyris.collegeboard.com/read/?forum=ap-calculus

>

--

--Louis A. Talman

Department of Mathematical and Computer Sciences

Metropolitan State College of Denver

<http://rowdy.mscd.edu/%7Etalmanl>

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