# What is Ti-89: Definition and 166 Discussions

The TI-89 and the TI-89 Titanium are graphing calculators developed by Texas Instruments (TI). They are differentiated from most other TI graphing calculators by their computer algebra system, which allows symbolic manipulation of algebraic expressions—equations can be solved in terms of variables, whereas the TI-83/84 series can only give a numeric result.

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1. ### LU Factorization on Ti-89: 3x3 & 4x4 Matrix Solutions

What's the correct command for finding an LU factorization of a 3x3 and 4x4 matrix on Ti-89 graphing calculator? I'm trying to find the correct answers and verify/check my answers for Linear Algebra problems.
2. ### Fourier Transform TI-89

Summary:: My TI-89 is not evaluating the Fourier transform? Change angle to radians and retry. Hello, I discovered this forum trying to answer the question: Why is my TI-89 not properly evaluating the Fourier transform? I found no answer, by chance I experimented and found that the calculator...
3. ### Is this the correct way to compute the row echelon form?

This is actually a pretty simple thing, but the ref(A) that I compute on paper is different from the ref(A) that my TI-89 gives me. Compute ref(A) where A = \begin{bmatrix} 1 & 2\\ 3 & 8 \end{bmatrix} \\ \begin{bmatrix}1 & 2\\ 3 & 8\end{bmatrix} \ r_2 \rightarrow r_2 - 3 \times r_1 \\ \\...
4. ### Calculators Weird TI-89 Lockup Behavior

So, I foolishly bought a TI-89 Titanium on Ebay that was known to be in a locked up state. I've fixed locked up things before and figured I could here, too. Bad move. A thread here indicated that the hot car trick might fix it. I thought it had, but basically I think that was just due to...
5. ### Feet Inch Sixteenth Program

I was wondering if anyone here has a program for their ti-89 that can add and subtract dimension in ff.iiss format. Also it would be great if you could convert ff.iiss to decimal feet and vise versa. For example I would want to enter in 10.0608 (10 feet 6 and a half inches) and convert it to...
6. ### Ti-89 Calculator question (Statistics)

Homework Statement Calculate the mean and standard deviation for the random variable X which equals the sum of the dots facing upward when two standard six-sided dice are rolled. The Attempt at a Solution In List 1, I entered all the possible values of the random variable X...
7. ### Calculators How to find the Wronskian on Ti-89?

I'm doing a problem about finding the Wronskian but I want to check my answer if it's right or not. How do I find the Wronskian of that problem on Ti-89 Titanium?
8. ### Calculators Ti-89 cabable of a html format viewer?

I have .Html files I can use offline. Is there viewer for html on the ti-89?
9. ### Calculators Clear Variables on TI-89 to Solve ODEs

So the TI-89 can solve ODEs and the arbitrary constants show up as @1, @2, @3, etc. Every time I put in a new ODE it uses the next constants @4,@5 etc. How do I clear them to get back to @1,@2 again? There used to be a sub forum here on math software etc. but I cannot find it now so I posted...
10. ### Calculators TI-89 how to save result of an embedded funtion to a variable

Hello, I do a lot math and physics work, (predominantly advanced fundamental theories), and have consistently been hindered by a particular issue when it comes to a few of my defined functions. I feel like it would be a kind of "order of execution" issue with a simple solution, but though I've...
11. ### Ti-89 Limit of Integral undefined BUT it is 4 both by hand and Mathematica

I am giving the following input to Ti-89 Titanium: limit(S((2 x cos(100 x Pi x t)+2 x sin(10 x Pi x t))2 ,t,-t1,t1)/(2 x t1),t1,inf) where S is the integral symbol, Pi is π = 3.14, x is the multiplication symbol and inf is the infinity symbol The TI-89 answer is undef If I do it by hand it...
12. ### Calculators Definite Double Integrals 2 variables TI-89 Titanium

Hello I am trying to solve this integral 25-9x^2-25y^2/9 dydx integrating from 0 to sqrt(9-9x^2/25) and the limits of the second integration are 0 to 5. I can find tutorials on how to find the definite double integral of a single variable, but not for two variables. Any clues? edit: so far...
13. ### Calculators TI-89 Programming question.

Hi there, I’ve come across a problem I can’t seem to solve. What I want to do is make a text box that with scrollable information. For example, when you do “One Var Stats” on the Stats and List Editor where it has all the information you scroll through and only the “Enter=OK” button. I’ve...
14. ### Calculators TI-89 - how to delete equation on numeric solver?

The topic says it all. I am trying to figure out how to delete unwanted equations out of my TI-89 "numeric solver" app. I consulted the manual...nothing. I have googled and youtubed...nothing. Any help here would be great as I love the numeric solver app but it is becoming hard to find the right...
15. ### Calculators Solving Text Entry Issue on Ti-89 Titanium

I have a Ti-89 titanium and its not allowing me to enter text into an equation without writing over the equation. Is there a way I can change this? It seems like I could do this before, I thought maybe I accidentally pressed something without realizing it.
16. ### Calculators Error on the TI-89 Titanium

I was working with a much longer equation and receiving a result I didn't expect, and finally narrowed it down to the following section: 2(-2^3)-3(-2^2) 2(-2^3) is correctly calculated as -16 independently, and 3(-2^2) is correctly calculated as 12 (again, independently) for a difference...
17. ### Calculators Area of Region w/ bounds, TI-89 syntax/method

Hello, I'm struggling to figure out the syntax/method (on a TI-89) for finding the area of a curve bounded by the x and y-axis (and the curve) in a particular quadrant. Respectfully submitted, McFail
18. ### Calculators Using Ti-89 to solve for Three dimensional Principle Stresss

I've got a TI-89 Titanium I've taking a class in Mechanical Design and my professor informs me that we need to be able to solve the equation (equation 3-15) shown in the attachment. I've been trying to find a way to program it into my calculator, but haven't had any real success. The...
19. ### Calculators Integration using a TI-89 produces wrong value?

Hi Physics Forum, I've just started taking Diff EQ and have been using my calculator for most integrations. I've come across two problems that I hope have answers. 1) When I try the integral of (x+1) (the quantity! not just x+1), my calculator still spits out (x^2/2)+x while the real...
20. ### Calculators Solving ODEs on the TI-89: Tips & Tricks

1. Is it possible for the TI-89 to solve Exact Equations? Ex: (2x-1)dx + (3y+7)dy = 0 I've tried various forms of input, but I cannot find a way for the Calculator to give me a complete answer. My best luck so far was: (2x-1)x' + (3y+7)y' = 0. The y' part was correct, the x' part was...
21. ### Find the general solution for x^2*y''-2y=0

I have searched for a long time and i can't find a clear answer I want to find the general solution for x^2*y''-2y=0 using deslove and i typed it in as desolve(x^2*y''-2y=0,y) and it says too few arguments then i tried desolve(x^2*y''-2y=0,y,x) same thing, then i switched the y ans the...
22. ### TI 89 program missing a parenthesis

I'm trying to write a program to find midpoint and distance. And here's what I have. Prompt dist If dist=1 then Prompt x,y,x2,y2 √((x2-x)^2+(y2-y)^2)→d Disp d Else Prompt xx1,xx2,yy1,yy2 (xx1+xx2)/2→a (yy1+yy2)/2→b Disp a,b Endif Endprgm When I try to run this program it...
23. ### TI 89 Help complex Function Evaluation

Is it possible to evaluate the limit of a complex function on a ti 89?
24. ### Calculators TI-89 Emulator

I left my TI-89 calculator at the last psyche ward I admitted myself to, and so began searching for emulators online the other day. I found this one, and it works exactly like the real thing: Ti-89 Emulator Enjoy!
25. ### Calculators How to put code on MS WORD onto TI-89

My Thermodynamics teacher gave me a code for various calculators to put into the calculator for Interpolation. I am just wondering how you put this code that is in MS WORD onto my TI-89. I have the TI-Connect software. Here is what is looks like: This code is for the TI-89: interpol()...
26. ### Calculators Ti-89: Which One to Buy?

So I was looking on Amazon.com and found ti-89s for sale. I saw this add: https://www.amazon.com/dp/B0002QKTXK/?tag=pfamazon01-20 If you read the description, it talks about the calculator having 4gb of DDR memory and intel dual core processors... This all seems fishy considering none of...
27. ### Calculators TI-89 won't factor or expand polynomials

When I use the factor or expand functions on my TI-89 it outputs a matrix with values that are seemingly coming from no where. For example, if I ask my calculator to expand (3-x)^2 it gives the matrix [45, 12; 12,13]. Why is it doing this? How do I fix it?
28. ### Calculators TI-89 Titanium or TI-Nspire CX CAS?

Hi. So, for the first time my younger sibling will need a graphing calculator for their classes so I'm giving them my TI-84 Plus and getting myself a new, better one. Right now I'm a Junior in high school taking ap-chemistry, ap-physics and ap-calculus AB. Next year I'll be taking calc BC (my...
29. ### Calculators TI-89 won't graph whole function?

When I try and graph x^(2/3) in my TI-89, it only graphs the half of the graph where x>0. My TI-84 gives me this: But my TI-89 only gives me the right half. Is one of my settings wrong?
30. ### Calculators Plotting modulus functions in TI-89 Titanium

How do I plot modulus functions in TI-89 Titanium? When I enter y1(x)=mod(x), in the y= editor, an error message turns up saying 'Too few arguments'.
31. ### Calculators Setting changed on my Ti-89 Titanium

I am not sure what I did, but a setting changed on my Ti-89 Titanium. I used to be able to go back to my input line and add new characters like a parenthesis or a missing number. This is one of the big advantages to a ti-89, however, somehow, When I go to insert new characters, they erase the...
32. ### Calculators Something wrong with my TI-89 Titanium

There is something wrong with my TI-89 Titanium. When I enter factor(x^2-5x=6), it displays the answer as 6.17481 E12/ (2)^11 * (5)^13. I've checked all the mode settings and they seem to be same as the initial settings. Any idea what could be wrong?
33. ### Calculators TI-89- How do I make programs?

I would like to make a program for which you give two vectors, A and B, and it returns (A^2 + B^2)^0.5. How can I do this?
34. ### Calculators TI-89 Basic Physics Settings/Calculations Help

Ok, new to the forum and taking my first real science credit physics course (I have taken one prior but it doesn't count towards the major). I'm in somewhat of a bind here as i just got a TI-89 titanium thinking that more was inherently better, I am now regretting this decision. When i go to do...
35. ### Calculators Connecting old TI-89 to computer

I have the "old" TI-89 (no titanium) and it has 2,5 mm plug. Is it possible to connect the calculator to the computer via USB? I have a cable that came with the calculator, but it's connected to the serial port and my computer hasn't that on it. I have an serial-to-usb adaptor, but I haven't...
36. ### Calculators How to write Upper Case letters in TI-89

Hello am interested how to write upper case letters in TI-89 I have read the manual how to write the upper case letters but whenever i press enter the calculator doesent show the upper case letters on the sceen instead it only writes lower case letters. For example i press white upper...
37. ### Calculators Ti-89 Differing Answers from Integration

I am running into an interesting problem on my ti-89 and was wondering if anyone could explain the reason for the following. I am attempting to solve the following: M=\int_{x}^{y}sin(\theta )*(r-a*cos(\theta ))d\theta r = 0.14 a = 0.09 where, x = 0 deg y = 120 deg The calculator gives me...
38. ### Calculators TI 89 or TI nspire CAS CX

Hi. I'm going to university in a month to study Electrical Engineering.I already have an TI83 + , but I'm thinking of upgrading to a TI 89 or TI Nspire CAS CX because they both have CAS. Now from what I've read on the Internet the Nspire CAS seems better because of the higher resolution color...
39. ### Calculators Finding sequences on the TI-89 Titanium Calculator?

Can someone guide me toward using my TI-89 Titanium calculator for sequences? I would like to be able to PUT IN a sequence of numbers and have it GIVE ME the formula. Not vice versa please. Thanks.
40. ### Calculators Running into a problem with a TI-89 Program.

Okay so recently I downloaded a Conic section program on my TI-89 Titanium. It has had several issues, which I managed to fix, but I can't fix this one. It can only sometimes find the radius of a circle. From the standard form equation 3x^2-12x+3y^2+6y-15=0 it gets the radius right, which is...
41. ### Calculators 100000 instead of 10E5 on Ti-89?

100000 instead of 10E5 on Ti-89? Hi, guys. I've been using Ti-89 over 5 years so far. When the huge number such as 10^10 x 10^10 was calculated, it used to show me 1E20. Not anymore. I got 100000000000000000000... instead of 1E20. Can you guys help me out? Thanks.
42. ### Calculators Finding unknown terminal value of integral with TI-89

Given \int_2^k \! (3x+4) \, \mathrm{d} x = 43.5 how would I use the TI-89 to solve for k?
43. ### Calculators Scrolling down on text programs (Ti-89)

I just downloaded a couple programs on my 89 but when I push down its kicks me out of it. I know this is probably an easy fix but thanks in advance!
44. ### Calculators My TI-89 T'm stays busy

I loaded TIRPN on my TI89 Titanium, and when it runs, the busy indicator stays on and the app runs very slowly. VERY Slowly. But it does function, and I can exit the app back into the regular worktop and the system recovers its speed. My calc is not fully loaded down with apps. Is...
45. ### Calculators Putting Colebrook Equation into TI-89

Does anyone know how to put the colebrook equation into the TI-89? here is the equation: 1/sqrt(f) = -2log [(k/D)/3.7 + 2.51/(Re x sqrt(f))]
46. ### Calculators Ti 89 not connecting to computer

Hi guys, just found this site, hopefully you can give me some help with my calculator. I bought a ti-89 titanium at the beginning of fall semester, roughly 6 months ago. It has connected to my laptop fine since I had it, but just started having trouble the other day. When I connect the USB cable...
47. ### Calculators Calculating Sum of Series on Ti-89 | 3 Decimal Places

Hey, I'm having trouble with plugging sum series into my Ti-89, and was wondering how to do it with things converging and going to infinity. I have the sums rounded to 3 decimal places that my professor gave me, however, I can't figure out how to get it from the calculator. For example I have...
48. ### Solve TI 89 Programming r(θ): Learn How to Input Expression & Variable

Hi, I'm trying to fine-tune a function I wrote for the TI 89 Titanium. Basically, for part of my function, I need it to plug in θ (an inputted variable/argument) into an expression r(θ) - also a an inputted variable/argument - and yield a numerical result. In other words, the input format is...
49. ### Calculators Help with newly installed program on TI-89

Is anyone familiar with the program "LM v1.0". It simplifies expressions via minterms. I have downloaded it and installed it on the TI-89, and I can find the program on the calculator. However, when I type in, exactly as the instructions say to, I get no output; that is, it merely displays what...
50. ### Calculators TI-89 Titanium Function Issues

Hello, I am new to the TI-Titanium and have run into a few rather simple obstacles that are keeping me from answering physics questions in the correct way. First off, by typing: \sqrt(5) the answer comes out to: =\sqrt(5) as opposed to 2.2360... (I believe this is a setting/mode issue)...