Question about Texas Instruments TI-89 Calculator

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I can't differentiate a function and I'm quite

I can't differentiate a function on my TI-89 and I'm quite certain I'm entering it correctly. For example, if I enter d/dx(x^2+3x,x) my calculator gives me an answer of 3. Anyone have this problem? I don't know if it's a mode setting or what. Thanks in advance for any help with this.

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Hello,
Clearly the x variable stores value zero. Press [F6] ( 1:clear a-z) [ENTER] and restart your derivative.
Hope it helps.

Posted on Sep 29, 2009

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1 Answer

TI-89 "ln" function returning a "ln" answer


To convert a result from symbolic to numeric, press diamond ENTER. To have all results appear in numeric form, press MODE F2, use down-arrow to get to the "Exact/Approx" line, press right-arrow, down-arrow to "3:APPROXIMATE", press ENTER ENTER.

Feb 07, 2013 | Texas Instruments TI-89 Calculator

1 Answer

Hey I am trying to use the DeSolve funtion on Texas TI-nspire cas. I insert: DeSolve(2x=0, x) and I get a error message. What am i doing wrong


deSolve( ) solves differential equations. The general syntax is deSolve(1stOR2ndOrderODE, Var, depVar). The first argument must be a first order or second order differential equation, the second argument is the independent variable, and the third is the dependent variable (the name of the function you are trying to obtain.)
Your command does not have a differential equation, and it does not have the dependent variable.

Sep 18, 2011 | Texas Instruments TI-89 Calculator

1 Answer

Where can I find the log values in TI 89


For natural logarithms, you can use the ln function (2ND shift of the X key). For example, the natural logarithm of 3 is 2ND [LN] 3 ) ENTER.

For logarithms to other bases, use the log function (diamond shift of the 7 key). For example, the base-2 logarithm of 16 is diamond 7 1 6 , 2 ) ENTER. If the base is 10 (common logarithms), you can omit the comma and the second argument.

Mar 09, 2011 | Texas Instruments TI-89 Calculator

1 Answer

How do i do difference quotient on my ti 89?


The function avgRC( calculates forward-difference quotients and the nDeriv( calculates central-difference quotients. Take your pick. You can also use the d( differentiate function.
You can also create a small program or function that gets a function as argument, along with the variable and the step and returns one of the difference quotients. (central, forward, or backward).

Jul 19, 2010 | Texas Instruments TI-89 Calculator

2 Answers

Derivitive help


Your x or X variable contains garbage values coming from some previous calculations.
In Home screen press [2nd][F1] to activate the (F6) function key.
Select [1: Clear a-z] or [2:NewProb]
This will clear the contents of all one-letter variables.
Press [F3: Clac] and select [1:d ( differentiate]
Enter the function right after the left parenthesis
Enter a comma
Enter the name of your independent variable, presumably x
Close the parenthesis and press [ENTER]

In the following screen capture the pipe symbol | may not be available to you on the TI89 keyboard, so you must find it at the end of the [CATALOG].
00e6d4d.jpg
The screen capture come from a Ti92Plus not a Ti89 (the screen is larger), but the instructions given above are valid.

Jun 16, 2010 | Texas Instruments TI-89 Calculator

1 Answer

Hi so i have to use the cos, sin , and tan functions on my ti-89 but when i press enter it says "Error: protected memory violation"... i need to use those keys for a precalc test tomorrow and i dont know...


Hello,
My guess is that you entered as variable of the the functions, the name of a variable that is reserved (system variable, app variable ). In Home screen press [F6: Clean up][ Clear a-z] [ENTER] and stick with x as function argument.
Hope it helps.

Oct 02, 2009 | Texas Instruments TI-89 Calculator

1 Answer

Cannot get TI-89 calculater out of Mode. What do i need to do?


Hello,
Press [ESCape] or [ENTER] to save. You can also use [2nd][QUIT], or just press [HOME]
Hope it helps.

Sep 22, 2009 | Texas Instruments TI-89 Calculator

1 Answer

When I differentiate or integrate using TI-89, i get in solution sometimes 0h0 or 0HFFFF, what do these mean?


Hello,

You calculator is set to base mode Hexadecimal (numeration in base 16). Change this mode to decimal.
Press [MODE] [F2] you get the base setting at the bottom of the screen. Press [Right arrow] and select 1 (dec)55db158.jpg
At this point Enter to save configuration.

Hope it helps

Sep 04, 2009 | Texas Instruments TI-89 Calculator

3 Answers

IF I HAVE TWO equations 5x+8y=54, AND -9x+y=26 how do i solve


use the simultaneous equation solver software available on ur ti-89 and enter the equation in the form of augmented matrix and you will get ur answer.

Dec 03, 2008 | Texas Instruments TI-89 Calculator

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