ti-89 Definition and Topics - 54 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. kostoglotov

    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 \\ \\...
  2. M

    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...
  3. Q

    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...
  4. T

    Calculators 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...
  5. Digitalism

    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...
  6. N

    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...
  7. LTME

    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...
  8. P

    Calculators Ti-89 Question

    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.
  9. K

    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...
  10. M

    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
  11. N

    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...
  12. V

    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...
  13. E

    Calculators ODE's on the TI-89

    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...
  14. O

    Find the general solution for x^2*y''-2y=0

    I have searched for a long time and i cant 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...
  15. B

    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...
  16. S

    TI 89 Help! complex Function Evaluation

    Is it possible to evaluate the limit of a complex function on a ti 89?
  17. phion

    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!
  18. C

    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()...
  19. H

    Calculators Which Ti-89 to get?

    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...
  20. L

    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?
  21. L

    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...
  22. A

    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?
  23. N

    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'.
  24. E

    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...
  25. N

    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?
  26. P

    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?
  27. T

    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 doesnt 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, im now regretting this decision. When i go to do a...
  28. P

    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...
  29. W

    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...
  30. J

    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...
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