Question about Texas Instruments TI-89 Calculator

# I can't differentiate a function and I'm quite

I can't differentiate a function on my TI-89 and I'm quite certain I'm entering it correctly. For example, if I enter d/dx(x^2+3x,x) my calculator gives me an answer of 3. Anyone have this problem? I don't know if it's a mode setting or what. Thanks in advance for any help with this.

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Hello,
Clearly the x variable stores value zero. Press [F6] ( 1:clear a-z) [ENTER] and restart your derivative.
Hope it helps.

Posted on Sep 29, 2009

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Posted on Jan 02, 2017

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2 Answers

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In the following screen capture the pipe symbol | may not be available to you on the TI89 keyboard, so you must find it at the end of the [CATALOG].

The screen capture come from a Ti92Plus not a Ti89 (the screen is larger), but the instructions given above are valid.

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1 Answer

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Hello,
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1 Answer

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