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Topic: [ap-calculus] TI-89 question
Replies: 3   Last Post: Sep 28, 2012 9:14 AM

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 SpartanRedWing@aol.com Posts: 82 Registered: 12/6/04
Re: [ap-calculus] TI-89 question
Posted: Sep 27, 2012 7:24 PM

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Check the memory and see if a zero got stored in x. The 89 does funny things once you assign a value to x. It won't overwrite it like the others.

Mark Kiraly
Ryan High School
Denton, TX

Sent from my iPhone?. Or my Motorola Atrix II?. Or my HTC Aria?. Or my  Nokia Windows 7?. Or even my Sony Xperia? phone on AT&T. You may never know.

Definitely sent from a mobile device, so please excuse typos and brevity of answers.

-----Original message-----
From: Jewel Filipovich <jfilipov@lamar.k12.ga.us>
To: AP Calculus <ap-calculus@lyris.collegeboard.com>
Sent: Thu, Sep 27, 2012 22:46:45 GMT+00:00
Subject: [ap-calculus] TI-89 question

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.
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I have used a TI-89 for a long while and never come across this problem.
One of my student's calculator: when you ask it to determine a derivative
entered as d(2x^2 +3x,x), I get an answer of just 3, rather than 4x + 3. It
does not matter if you put multiplication signs in between either. Any
thoughts??

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