Question about Texas Instruments TI-89 Calculator
Posted by Anonymous on
Hey, i have nearly the same problem and now finally found a solution to it. In my case half of the screen was empty and the other worked correctly AND slight pressure to the frame surrounding the display on the side of the defect half and/or above the display makes the display reappearing again. Because it's annoying if you always have to press with one hand on your calculator while working with it i did the following: Important: Make sure that... ... you have a backup of the data stored on your TI because you could lose them during the following procedure. ... we are really talking about the same problem. ... this hints come without any warranty and you might destroy your calculator completely following this advice. 1. Open your TI 89 as described for example in  2. Take a piece of foam rubber and cut out a stripe with a shape like |_ or "L", about 1cm in width which fits approximately the frame around the display on the the defect side and the top. 3. Place the foam rubber on the silver shield you see after opening the back of your TI. 4. Then you can assemble your calculator again. I hope i could help you!  http://richfiles.solarbotics.net/Turbo89.html
Posted on Sep 21, 2007
Well, to answer part of your question, yes... the TI-89 does factor like this. it is inputted like this:
Check the catalog in the TI-84 (which is 2nd-zero) and look under F for factor()
Posted on Jan 19, 2009
I assume you are speaking of solving a system of equations with a number of unknowns. If not, please correct me. Here's an example in practice:
If you have a system of 3 equations with 3 unknowns, you would set up your matrix so that the coefficients of each variable for a particular equation are on one row. So, given equations x + y + z = 0, 2x + 3y - 4z = 1, x + -z = -1 you would type the following into your calculator: [[1,1,1,0][2,3,-4,1][1,0,-1,-1]] and press enter to make sure you typed it correctly. notice that in the third row there is a zero, since we have zero time y for the third equation. Then row-reduce the matrix (2nd > 5 > 4 > 4 or in the CATALOG as rref). You should get out the matrix [[1,0,0,-1][0,1,0,1][0,0,1,0]]. This says that x=-1 y = 1 z=0 since my first column contained the coefficients for the x variable, the second for the y variable, and the third for the z variable. The last column contains the solution, the part on the other side of the equals sign.
Hope this helps! For more reading (from someone else; I just made this one up), check out the Wikipedia articles on Gaussian elimination and Systems of linear equations
Posted on Oct 03, 2009
This error is due to 3rd-party software not compatible with the Operating sytem. The software is trying to access a memory address (location) reserved for the OS or for an application.
To correct it:
The following procedure will completely reset the calculator. Note that this will erase the memory of the calculator and restore all manufacturer's defaults.
• Hold down the following keys [2nd] [<] and [>] (right and left arrow keys)
• Press [ON]
• Release all the keys at the same time
• Adjust the contrast, if necessary.
Posted on Feb 03, 2010
If you're willing to have all RAM cleared, try a hard reset.
Press and hold the 2ND, Left-arrow, and Right-arrow keys.
Press and release the ON key.
Posted on Feb 20, 2010
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