# TI-89 Titanium help

by triden
Tags: ti89, titanium
 P: 173 I just got a TI-89 off ebay for the upcoming school year to help with calc and engineering studies. My old calculator was a ti-83plus and I knew that baby inside and out. I am trying to become familiar with the 89 before school starts, but there is one major thing I can't really figure out (short of reading the manual ). When I do a calculation and enter in say 30/52, I get out 15/26 instead of a decimal number. How can I change this? Also, are there any good tutorials out there that are recommended? Cheers, Chris
 P: 838 To get a decimal representation, press , You can change the way the calculator represents numbers by pressing, go down to "Exact/Approx" and change it to auto, exact, or approximate. you are probably in exact mode right now. As far as tutorials go, I can't help you with that. If there is something I need (I just assume the calculator can do it), I look it up through google, or use the manual.
 PF Patron Sci Advisor P: 2,207 Actually, he's probably in "auto" mode right now. You could change the mode to always spit out decimal numbers ("approx" mode), or you can just add a decimal to one of the numbers in "auto" mode. In AUTO mode- 30/42 = 5/7 but, 30/42. = .71429 So no decimal gives you the reduced fraction, but adding a decimal point gives you the decimal number. Also, I highly recommend www.ticalc.org for downloads of user-made programs. You can find all sorts of useful stuff there! You will find many useful math and "science" (a.k.a. engineering) programs in the http://www.ticalc.org/pub/89/basic/ directories (careful you don't get distracted, there are lots of games too lol). Also take note that the TI-89 can run TI-92 Plus BASIC files, so you can look around in there too.
P: 3

## TI-89 Titanium help

Need assistance on TI-89 question, can anyone help?
When I attempt to factor, I get a numeric answer.
For example, on page 51 of manual I attempt to factor(x^2-5,x). I get 59.
thnx
 PF Patron Sci Advisor Emeritus P: 16,094 I bet you've defined x to be 8. You need to undefine x if you want to use it as a variable!
 P: 3 Thnx for the quick reply. This may be a stupid question for you , but how do I undefine x?
 P: 838 go to tools (press F1 - its the menu at the top), go over to Clean Up (press F6), and hit 1: (Clear a-z)
 P: 3 OK!, thanx a million!
 P: 483 Make sure you never store values to the common variables like x, y, z, and t!
 P: 94 Remember to put some good games on it too.
 P: 4 How do u divide polynomials on the ti-89 titanium? i only no how to add and subtract it.
 PF Patron P: 1,686 One way of doing it is to do symbolic polynomial division. Basically you just assign each polynomial to a variable: http://www.brookscole.com/math_d/tem...ial_Division_2
 P: 4 I did the clean up but when i put the example in it says syntax. and i dont get it when they say to put something about f/g? What did i do wrong? I know everything about electronics inside out but this calculator shut me up. yours truely, the confused one.
 PF Patron P: 1,686 Okay here is what you do [after you clear A-Z]: 1) There are two parts to the fraction, the number being dividend and the one begin the divisor. You have to assign each of these into a variable. 2)Place the divided into a variable, lets call it f. Do the following: x^4+3x^3+7x^2+7x+8 [then hit the STO key] f. Having done this, f will now have the value of the divided number. It appears like this on your screen: x^4+3x^3+7x^2+7x+8->f 3) Do the same for the divisor. x^2+3x+4 [then hit the STO key] g. Having done this, g will now have the value of the divided number. It appears like this on your screen: x^2+3x+4->g 4)Then hit F2 and select the desired function. For a case like this, select propFrac(). 5)Then enter f/g within the parenthesis of the propFrac function: propFrac(f/g) You dont really have to assign the polynomials to variables. You can simply enter the polynomials straight into the propFrac function.
 P: 2 just got a new ti-89, wondering how to change a decimal to a fraction on it, just a simple thing and cant figure it out, any help?
 P: 1 I bought a TI-89 Titanium about a year ago, but since then I have moved from Washington (state) to Virginia. Somewhere in between here and there is the cd that came with my TI-89. I need to hook it up to my computer for various things, and need the driver off of that cd. Is there anywhere online that would have that driver? I have thoroughly searched the TI websites and have googled my eyes out trying to find this thing. Any help is appreciated.
PF Patron
P: 1,686
 Quote by txxp4 just got a new ti-89, wondering how to change a decimal to a fraction on it, just a simple thing and cant figure it out, any help?
One way of doing it is to change your mode from approximate to exact.
PF Patron
P: 1,686
 Quote by hirtmd I bought a TI-89 Titanium about a year ago, but since then I have moved from Washington (state) to Virginia. Somewhere in between here and there is the cd that came with my TI-89. I need to hook it up to my computer for various things, and need the driver off of that cd. Is there anywhere online that would have that driver? I have thoroughly searched the TI websites and have googled my eyes out trying to find this thing. Any help is appreciated.
You need the TI Connect software.
http://education.ti.com/educationpor...i_connect.html

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