Question about Texas Instruments TI-89 Calculator

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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Posted on Jan 02, 2017

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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

To solving this problem you have to do next: type **2nd** then **F1** and

option 2:**NewProb**. Finally type **Enter**

option 2:

Jan 26, 2012 | Texas Instruments TI-89 Calculator

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.

Your command does not have a differential equation, and it does not have the dependent variable.

Sep 18, 2011 | Texas Instruments TI-89 Calculator

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.

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

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).

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

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].

The screen capture come from a Ti92Plus not a Ti89 (the screen is larger), but the instructions given above are valid.

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].

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

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.

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

Hello,

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

Hope it helps.

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

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)

At this point Enter to save configuration.

Hope it helps

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)

At this point Enter to save configuration.

Hope it helps

Sep 04, 2009 | Texas Instruments TI-89 Calculator

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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