Question about Texas Instruments TI-89 Calculator

Open Question

My ti89 calculator's screen is frozen at undefined variable. how do i get back to the main screen? I am stuck

Posted by on

  • kakima Nov 09, 2010

    What happens if you press the ESC key once or twice?


6 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

  • 16 Answers

SOURCE: undefined variable

go to home and type Define x

Posted on Jul 09, 2008

  • 7993 Answers

SOURCE: how to use ti-89

The calculator is very sophisticated but it does not solve all problems. In particular it does not know (does not have) the Integration by parts algorithm. But you can always have a numerical value of a definite integral.

To store a number in any variable
You enter the number 18[STO->][Alpha]A stores 18 in A.

My opinion is that you cannot take advantage of the functionalities of this calculator if you do not take some time to consult the manual. You do not have to read the whole thing, just read the chapter or the exemples that show you how to handle your current question (whatever it may be.)

Hope it helps.

Posted on Sep 12, 2009

  • 60 Answers

SOURCE: cube roots on ti89

The TI-89 has one function to find whatever root you want of a number.

To find the cubed root of say...64, you would type:


Posted on Nov 14, 2009

  • 102366 Answers

SOURCE: i cannot plot graph in my Ti 89 graphing calculator

That means one (or more) of the variables you have in your function is not defined. Check to make sure you didn't misspell any variable name. Also, check to make sure you didn't run two variable names together. "ab" is the variable ab, not a times b.

Posted on Feb 18, 2010

  • 1869 Answers

SOURCE: A student tried to enter an inequality into her

these calculators have a small ram memory battery inside open the case remove it then put it back in "think watch battery" this happened to mine.

Posted on Jul 25, 2010

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Classpad 330

Here is a screen capture that may help you. Variable must be x. Be careful what type of brackets you use to enclose the arguments. use the ones that are on the same line as Pi, theta, i.

Sep 19, 2013 | Office Equipment & Supplies

1 Answer


You referenced a variable that is not currently defined. For example, you referenced a stat variable when there is no current calculation because a list has been edited, or you referenced a variable when the variable is not valid for the current calculation, such as a after Med-Med.

Jun 06, 2013 | Texas Instruments TI-83 Plus Calculator

1 Answer

TI89 is has locked up with error msg "undefined variable"

Without performing a hard reset, you can avoid implied multiplication and insert a multiplication sign (*) between a variable and a function. For example if you enter xsin(x) you must insert the multiplication sign (*) and write x*sin(x), otherwise the calculator will assume that xsin( is a function. It will look for it and not finding it, will send an error message. Similarly, if you want to enter x times y or some othervariable, you must insert the multiplication sign, x*y

Mar 06, 2012 | Texas Instruments TI89 Graphic Calculator

1 Answer

It's "frozen". won't change from the screen its

Try to reset it by taking out the batteries and leaving to sit for a minute or so, if that doesn't work take out the small battery as well and leave it sit, if you're still stuck you can call ti-cares (800-842-2737) they're generally very helpful.

Aug 05, 2011 | Texas Instruments TI89 Titanium Scientific...

1 Answer

I am trying to graph an equation, but the screen says undefined variable. On the y= screen I have 9 plots , with plot 1 listed as x:main\x y:main\y. The equation I entered was y1(x)=x^2-4 Please tell...

I''m glad you got this to work. For anyone else with this problem, in the y = page you can go to f5 and reset the settings, or you can highlight the plot 1 line and press [clear] this will not clear any other settings you may have inputted.

Mar 11, 2011 | Texas Instruments TI-89 Calculator

1 Answer

I just got the TI-Nspire. I'd like to solve a problem with undefined variables using Negative Exponent and things like the Expanded Power Rule. The Nspire will not let me store "x" as a variable. How...

You need the TINspire CAS (Computer Algebra System) to do symbolic manipulations. The Blue TINspire (with TI 84 keyboard) can only perform numerical computations.
If you use variables, the calculator will assign the numerical value stored in the variable.

Aug 17, 2010 | Texas Instruments TI-Nspire Graphic...

2 Answers

Derivitive help

Your x or X variable contains garbage values coming from some previous calculations.
In Home screen press [2nd][F1] to activate the (F6) function key.
Select [1: Clear a-z] or [2:NewProb]
This will clear the contents of all one-letter variables.
Press [F3: Clac] and select [1:d ( differentiate]
Enter the function right after the left parenthesis
Enter a comma
Enter the name of your independent variable, presumably x
Close the parenthesis and press [ENTER]

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.

Jun 16, 2010 | Texas Instruments TI-89 Calculator

1 Answer

Difficulties with producing a Residual plot.

In your calculations you are using a variable which stores a numerical value. In the HOME screen, on the command line use the keyboard to type in NewProb (case sensitive) and press ENTER. It will rest the variable to their default state.

If you are using a product of two functions, exeample x times sine of x, you must explicitely insert the multiplication sign otherwise the calculator will interpret the group xsin(x) as some unindentified entity.
If you have expressions such as 3*x you must not write them with the number to the right in the form x3. It will be interpreted as an undefined entity.

To avoid problems of interpretations always insert the multiplication sign.

Mar 02, 2010 | Texas Instruments TI-89 Calculator

1 Answer

Why does my ti89 when opening an APP dumps the programs in main

The home directory is where it does its cooking. If you want to work in some other directories go to that directory and run your application. But if you do so the application may look for a routine, a variable at the wrong place, and will not find it.

To avoid this problem, in Dos based computers you had a PATH variable, that contains all the possible paths to directories where a program might look for a necessary variable.

Hope it clarifies things.

Aug 26, 2009 | Texas Instruments TI-89 Calculator

1 Answer

Undefined variable

go to home and type Define x

Apr 13, 2008 | Texas Instruments TI-89 Calculator

Not finding what you are looking for?
Texas Instruments TI-89 Calculator Logo

Related Topics:

101 people viewed this question

Ask a Question

Usually answered in minutes!

Top Texas Instruments Office Equipment & Supplies Experts


Level 3 Expert

102366 Answers


Level 3 Expert

7993 Answers

Stevan Milanovic

Level 2 Expert

260 Answers

Are you a Texas Instruments Office Equipment and Supply Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides