20 Most Recent Texas Instruments TI-89 Calculator - Page 8 Questions & Answers

This is problem with graphing differential equation. Invalid Axes error occurs if Axes=TIME or if t(time) is set as a CUSTOM axis. This is important to noticed: if Fields=DIRFLD you cannot plot a time axis. See captured image

For fixing battery connector issue,click the link below :------http://technoanswers.blogspot.com/2012/01/battery-connector-issues.html ----------Thanks.

Just a suggestion to you the expert. You found a neat way to do something? Then write a TIP, clearly labeled so that people in need of this information will be able to find it.It serves no purpose to pretend to ask a question and then answer it yourself. A TIP or HOW TO writeup will be the perfect venue for such a thing.Sorry, I just did not want this illuminating procedure of yours to stay in the dark.

At first type next: Home, then 2nd F6: 2 option NewProb.Then graphing function, for example y=-x^2+28x+6

PPress left and right arrow and 2nd keys simultaneosly , hold it and then press ON. RRelease all keys and you will reset TI 89

Press and hold the [left-arrow], [right-arrow], and [2nd] keys. Press and release the [ON] key, then release the other keys.The above is from Appendix B of the manual.

Type cFactor for this expression! See captured image!

For example y=x^(1/3)-x+1. Type this function and then graphing it!See captured images

x^2+5x+7 won't factor any more.. if you're trying to solve it, do:

solve(x^2+5x+7=0,x)

In the View menu type select collapse all and you will see + sign

Remove battery from calculator and put it again. Then type in HOME 2nd F1 and 2:NewProb and ENTER. Try to solve any equations now. It may be resolve problem!Posted: Stevan Milanovic

have tried replacing its batteries!

Enter the first term as (-20^2), not as -20^2. Without the parentheses the calculator interprets it as
-(20^2), which is not what you want.

Also, make sure you use the (-) key just to the right of the decimal point and not the - key.

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.

I had the same problem. I changed the batteries and it didn't work. I took out the batteries for about 30 minutes, and then put them back in, and it turned on.

The TI-89 does not have a cube root function. However, you can calculate any root simply by raising to the reciprocal of the power. For example, to calculate the cube (third) root of 125, press5 ^ ( 1 / 3 ) ENTER

Try to clean the I/O Port ( USB) blow air inside
hope it will help