Question about Texas Instruments TI-89 Calculator

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When i ask to expand an equation the calculator will give me in error saying non algerbraic variable in the problem

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Clear the contents of variables. Somme variable of letter you are using contains an object incompatible with the arguments of the expand( function ; a matrix, a list, a reserved system variable.
Clear the calculator of old junk by resetting the RAM or executing the NewProb command, either from the keyboard or by pressing [Diamond][HOME][2nd][F6:CleanUp][2:NewProb][ENTER].

Here is a screan capture.
when i ask to expand an equation the calculator - 4814eed.png

Hope it helps.

Posted on Oct 06, 2009

  • k24674 Oct 06, 2009

    Should read: Some variable or letter you are using....



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TI 89 when solving equations or integrating a message appears:

With the ALPHA keyboard, Type in the NewProb command and press ]ENTER] It resets the one-letter variables to their default status.
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Another way is
In HOME directory, press the [2nd][F1] to activate the F6 key. In the menu list, press 1:Clear a-z and ]ENTER].
If you have to use the variable x multiplied by a function (sin, cos, tan, log, etc) do not used implied multiplication: enter the [*] explicitly.

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So im asked to get the derivative of an equation, for example 2x^4+3x^2. I press home, f3, and input my equation, ,x and then press enter. instead of the solution coming out to be 8x^3+6x, the solution...

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As you can see on the screen capture I am enclosing, if you just want to enter it and if n does contain a value already, all the calculator will do is to echo the command without modification. Obviously this is not what you want.

The screen capture shows you two other commands you can use solve( and expand (.

That should answer your question concerning how to enter the equation (look at the command line) and maybe help you decide what you want to do with the equation once it is entered.

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On the home screen, go to F6 ([2nd] [F1]) and then press [2] (NewProb). It should fix the problem.

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