Question about Texas Instruments TI-89 Calculator

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I am trying to enter the solution: Simplify the expression -3^2. I cannot find the ^ key, please tell me where the power key is on the TI-89?

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The ^ key is right above the divide key in the rightmost column of the keyboard.

Posted on Nov 04, 2010


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1 Answer

TI-89 incorrect answer

You're not doing anything wrong. The TI-89 simply does not reduce odd powers in square roots. If you change the 13 to 14 you'll see a rather different result.

Apr 11, 2012 | Texas Instruments TI-89 Calculator

1 Answer

How do you display fractions and how do you use the TI89 to solve fraction problems

Hi william_kien,

The Ti 89 solves a lot of fraction problems by being in the right mode and, the use of several commands. One of my first problems here at Fixya was to find a solution for, "How do i convert a decimal answer to fractions prefferably with matrixes."

Here the problem was solved just by being in the EXACT mode.

Another fraction nightmare, so I thought was to solve for, "I want to solve a Binomial Theorem problem!" You have to go to the end of the problem but, I solved it just by the use of the expand command.

The best way to display fraction is in Pretty Print and, in the EXACT mode. Here is a small demonstration of the 3 mode setting in the Ti 89 and, the effect of each to the way a fraction is displayed.

This is a demonstration of the Ti 89 simplifying and, displaying in fractional form in the AUTO mode.


This is a demonstration of the Ti 89 making numbers proper and, displaying them in fractional form while in the EXACT mode.


This demonstration of the Ti 89 not even converting in fractional form and, displaying in the APPROX mode.

You should always use parentheses when entering equations or, fractions into the calculator. Pictured just below you can see how the Ti 89 can miss-interpret what is being entered.

The propFrac command is a great tool to reducing to the simplest form.
propFrac(expression,var). This will return an expression as a
proper expression


Sometime with joining or, combining fractions you have to get the common denominator. As you can see below the comDenom command is a great tool for that.

The Ti 89's ability to compute fractions is only limited to the ability and, knowledge of the person using it. Even though, it has a tendency of making a not so, mathematically inclined person look like they have been doing them all there life.

I just gave several ways I go about solving and, displaying fractions. The best way to display fraction is in Pretty Print and, in the EXACT mode. Sometimes that isn't even enough and, you have to use parentheses and, commands to do the job.

Jan 10, 2011 | Texas Instruments TI-89 Calculator

1 Answer

Hi, I recently purchased a ti 89 calculator from a friend and I am having the following problem: The calculator will not evaluate trig functions. For example, if I type Sin(Pie/4) and hit enter, the...

The calculator is set up to produce exact results. If you want the expression to be evaluated put a decimal mark at the end of the 4.
to making 4 a floating point number instead of integer.
Alternatively, press the [MODE] key. Scroll down through the pages of options until you reach the line labeled Exact/Approx. When cursor is on that line, use the right arrow key to open the menu. Select [3:Approximate]. Press [ENTER] to save.

Aug 25, 2010 | Texas Instruments TI-89 Calculator

1 Answer

My TI-89 will not calculate the square root of 3

Press the diamond key, then press ENTER to convert a symbolic result to a decimal result. If you want them all in decimal form, press MODE then F2. Scroll down to Exact/Approx and change that setting to Approximate.

May 15, 2010 | Texas Instruments TI-89 Calculator

1 Answer

My TI-89 will not calculate the square root of 3

For this problem you have to type diamond key and then enter after primary input.
See captured image


Mar 27, 2010 | Texas Instruments TI-89 Calculator

1 Answer

How can I type in a radical expression and simplify it in radical form?

Sorry to disappoint you. You can enter a radical by making use of the square root or the universal power [^] with fractionary exponent, but once you press the [ENTER] key, your expression is calculated and displayed as a decimal number.
By updating the OS to version 2.53MP, you will be able to manipulate fractions more easily than your current OS version, but no facility is provided for radicals.

Feb 23, 2010 | Texas Instruments TI-84 Plus Calculator

2 Answers

How do I get my TI 89 to display 120/9 as 13.333333 instead of 40/3 ?

When in Auto or Exact mode, press Diamond then Enter to convert an exact expression to a decimal representation.

Jan 23, 2010 | Texas Instruments TI-89 Calculator

4 Answers

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:


Sep 15, 2008 | Texas Instruments TI-89 Calculator

1 Answer

Ti 89 Titanium

The only option or keys that will work is the ENTER key and the arrow keys. Try to get your arrow key to work by arrowing down and hit enter hopefully change you to something different.
Next, if at all possible can you hit the MODE key or get into the mode. If you get into the MODE select F3 and then arrow down twice or all the way to the bottom and at APPS Desktop select 1:OFF and then hit the ENTER key. Next, What I really think you need to do is reinstall the Ti 89 OS software. To do so you would need to connect to your computer or another Ti 89 Titanium to your Ti 89 Titanium. If you have Ti connect computer software (from the Ti site) connected to your Ti 89 Titanium it might help you more in troubleshooting any further problems too. You might be able to delete corrupt files that would free your calculator up and start running better.

Sep 03, 2008 | Texas Instruments TI-89 Calculator

4 Answers


Angle mode, Degree/radian setting, Chapter 2, pg 53 (pg70 of 623) Tan instructions pg 510 (appendix A pg 527 of 623) Here's your manual, download this file:

Jun 07, 2007 | Texas Instruments TI-89 Calculator

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