Question about Texas Instruments TI-89 Calculator

# Variables not appearing in differentiation and integration

For example when I input:
d(x^2,x)
it outputs
"2."

also, if I integrate:
S(x,x)
it outputs
".5"

Posted by on

### Anonymous

• Level 1:

An expert who has achieved level 1.

Governor:

An expert whose answer got voted for 20 times.

Corporal:

An expert that has over 10 points.

Mayor:

An expert whose answer got voted for 2 times.

• Contributor

What you do is go to the home screen and hit f6 and hit 'clear a-z' that will clear all variables from being numeric variables.

Posted on Sep 20, 2008

### Anonymous

• Level 1:

An expert who has achieved level 1.

• Contributor

Probably a value stored in the "x" variable (guessing x=1)
try the following, type or look for the "Define" function: Define X=X and see what happens, also try Cleaning the variables "F6>cleanup, etc" as a last resource do factory reset, but first archive your important files (not very recomended as some of them may contain the variable's value and just not solve this)

Posted on Sep 03, 2008

×

my-video-file.mp4

× ## Related Questions:

### Examples of homogeneous differential equation

Hi janeth sabay,

Have a good day!!

Here is your needed example for Homogenous differential equation:

The equation is said to be homogeneous if P and Q are homogeneous functions of x and y of the same degree. (1)

We can test to see whether this first order equation is homogeneous by substituting . If the result is in the form f(v)i.e. all the x's are canceled then the test is satisfied and the equation is Homogeneous.

Example 1: (2) (3)

There are no terms in x on the right hand side and the equation is Homogereous.Example 2: (4) (5)

So the original equation is not homogeneous.Methods Of Solution.

A solution can be found by putting y = vx on both sides of the equation:-

Example 3: (6)

Putting y - vx

Since y is a function of x so is v (7) (8) (9)

Separating the variables (10)

Integrating (11) (12)

Substituting (12) in equation (10) I can suugest you also to visit this site for more examples http://www.codecogs.com/reference/maths/differential_equations/homogeneous_differential_equations.php

Sep 12, 2011 | Toys

### 2x - 4y = 20 4x + 2y = -20

This should start wit X=something and Y=something, sorry I'm not an human algebra calculator....

Jul 29, 2011 | Computers & Internet

### Hi there. I'm using Casio FX-570ES scientific calculator. I would be glad if you could guide me as to how to obtain derivative of a polynomial expression e.g. y=12(x^2+6)^5

The syntax of the command is where function is the expression you are differentiating
x is the value of variable x at which you are evaluating the derivative, and tol is the tolerance (the error) you are willing to tolerate in the result.

If you do not want to specify a tolerance just omit the last comma and tol.

To enter the command d/dx you use key sequence [SHIFT][Integral]
To enter the symbol x in the expression you press [ALPHA][ ) ]
To enter a comma you use [SHIFT] [ ) ]
To enter a power of 10 in the tolerance use [x10^X] key

Example : Calculate The key sequence is as follows
[SHIFT] [Integral] 3 [ALPHA] [ ) ] [X^2] [-] 5 [ALPHA] [ ) ] +2 [SHIFT] [ ) ] 2 [SHIFT] [ ) ] 1 [x10^X] [(-)] 12 ) [=]

DO NOT confuse [SHIFT] [ ) ] which enters the comma and [ALPHA] [ ) ] which enters the variable X. May 28, 2011 | Casio FX-115ES Scientific Calculator

### Can i hook this amp to a 2 channle out put stereo?

Sure. Specs are listed below. I think it's designed for regular 2-channel input, isn't it? Front Channels: 100 W RMS x 2 @ 1.5 ohm-4 ohm (11V-14.5V)
• Rear Channels: 25 W RMS x 2 @ 1.5 ohm-4 ohm(11V-14.5V)
• Subwoofer Channel: 250 W RMS @ 1.5 ohm-4 ohm (11V-14.5V)
• THD at Rated Power: <0.03% @ 4 ohm (F&R), <0.05% @ 4 ohm (Sub)
• S/N Ratio (F&R): >108.5 dB below rated power S/N Ratio (Sub): >95 dB below rated power
• Frequency Response (front and rear): 5 Hz-30 KHz (+0, -1dB)
• Frequency Response (sub channel): 5 Hz-500 Hz (+0, -1dB)
• Damping Factor (front and rear): >200 @ 4 ohm/50 Hz
• Damping Factor (sub channel): >500 @ 4 ohm/50 Hz
• Input Range: switchable from 200mV-2V RMS to 800mV-8V RMS
• Differential-Balanced Input Topology: (3 pairs of inputs)
• Front Crossover: fully-variable (50 Hz-5 KHz), selectable- slope BP or HP (12 or 24 dB per octave)
• Rear Crossover: fully-variable (50 Hz-5 KHz), selectable- slope HP (12 or 24 dB per octave)
• Sub Crossover: fully-variable (40-200 Hz), selectable-slope LP (12 or 24 dB per octave)
• Preamp Output: 2-channel (full-range or LP)
• Bass EQ: Variable boost up to 15db
• Infrasonic Filter: defeatable 24dB/octave at 30 Hz
• Left minus Right Ambience Circuit: ambient effect for rear channels
• Front and rear speaker output connections: accept up to 8ga. wire
• Dual mono subwoofer output connections: accept up to 8ga. wire
• +12V and Ground connections: accept up to 4ga. Wire
• Dimensions: 19.7"L x 9.25"W x 2.36"H
• Dec 02, 2010 | Jl Audio 500/5 Car Audio Amplifier

### How to find derivatives using fx115-es

The syntax of the command is where function is the expression you are differentiating
x is the value of variable x at which you are evaluating the derivative, and tol is the tolerance (the error) you are willing to tolerate in the result.

If you do not want to specify a tolerance just omit the last comma and tol.

To enter the command d/dx you use key sequence [SHIFT][Integral]
To enter the symbol x in the expression you press [ALPHA][ ) ]
To enter a comma you use [SHIFT] [ ) ]
To enter a power of 10 in the tolerance use [x10^X] key

Example : Calculate The key sequence is as follows
[SHIFT] [Integral] 3 [ALPHA] [ ) ] [X^2] [-] 5 [ALPHA] [ ) ] +2 [SHIFT] [ ) ] 2 [SHIFT] [ ) ] 1 [x10^X] [(-)] 12 ) [=]

DO NOT confuse [SHIFT] [ ) ] which enters the comma and [ALPHA] [ ) ] which enters the variable X

Oct 29, 2010 | Casio FX-115ES Scientific Calculator

### Im not sure on how to caculate derivatives on the calculator, help would be appreciated

The syntax of the command is where function is the expression you are differentiating
x is the value of variable x at which you are evaluating the derivative, and tol is the tolerance (the error) you are willing to tolerate in the result.

If you do not want to specify a tolerance just the last comma and tol.

To enter the command d/dx you use key sequence [SHIFT][Integral]
To enter the symbol x in the expression you press [ALPHA][ ) ]
To enter a comma you use [SHIFT] [ ) ]
To enter a power of 10 in the tolerance use [x10^X] key

Example : Calculate The key sequence is as follows
[SHIFT] [Integral] 3 [ALPHA] [ ) ] [X^2] [-] 5 [ALPHA] [ ) ] +2 [SHIFT] [ ) ] 2 [SHIFT] [ ) ] 1 [x10^X] [(-)] 12 ) [=]

DO NOT confuse [SHIFT] [ ) ] which enters the comma and [ALPHA] [ ) ] which enters the variable X

Aug 27, 2010 | Casio FX-115ES Scientific Calculator

### Derivative feature does not work

The newer version of the OS 2.0.0.1188 is quite different from the initial version. It would be a good idea to upgrade the OS.
Back to your question. Since I upgraded my calculator, I am unable to illustrate the calculations with screen captures that are meaningful to you. If you do not mind I will show you how to calculate derivatives and integrals using OS Version 2.0.0.1188

In Calculator Mode
2. Use down arrow to highlight 4:Calculus or just press 4
3. Select 1:Numerical derivative at a point and press ENTER
4. An entry screen opens where you can select the name of the independent variable (default is x, not X), the point where you want the derivative and whether you calculate the first or the second derivative.
5. After you make your choices, you press ENTER and a template is displayed in calculator screen.
6. All you have to do then is to specify the function you are differentiating.
Here are a few screen captures to illustrate the process.    For the numerical integration
Select Calculus (see above)>Numerical Integration>ENTER.
Type in your integral using the template. Here is the procedure illustrated.  May 28, 2010 | Texas Instruments TI-Nspire Graphic...

### So im asked to get the derivative of an equation, for example 2x^4+3x^2. I press home, f3, and input my equation, ,x and then press enter. instead of the solution coming out to be 8x^3+6x, the solution...

You have some numerical value stored in the variable x, which the calculator is plugging into the resultant equation.

You can clear individual variables with 2ND [VAR-LINK]. You can clear all one-character variables a-z with 2ND [F6] 1. You can initialize the machine for a new problem with 2ND [F6] 2.

Feb 10, 2010 | Texas Instruments TI-89 Calculator

### Can i calculate calculus using fx-991ms

If you want to get an answer like 1/2X for d/dx(X^2), you will have to purchase a CAS calculator like Casio's Algebra FX-2 or Classpad. TI series calculators also have CAS.
However, you can calculate the numerical values of derivatives and integrals only.
To calculate the value of a proper integral:

1. Press the 'ON' key;
2. Press the Integral key ;
3. Enter your expression (example X^2+X-3 etc);
4. Press the 'comma' key after your expression;
5. Input the first limit after comma, input comma again after first limit;
6. Close brackets;
7. Press the equals key, display may return after a while with the answer.
for eg to calculate xdx from 0 to 2, input as follows:

dx(X,0,2)

To calculate derivative at a point:

1. Press Shift and then the integration key.
3. Input comma;
4. input the point at which you want to evaluate the derivative;
5. Close bracket and press enter.
Example, to calculate d/dx X^2 at 3 input:

SHIFT+dx key X^2,3)

Display looks like this: d/dx(X^2,3).

Oct 23, 2009 | Casio FX-300MS Calculator

### Differentiating and Integrating Problems

Hello,
This means that you are using a non-algebraic variable in an expression. I know, I am not even paraphrasing. Exemple: if you write 2 + johnQ, where johnQ is a table of data, a picture or a GDB, graphical data base object. Here is an exemple where mat is a 2X2 matrix and mot is a table.
Hope it helps.

Sep 14, 2009 | Texas Instruments TI-89 Calculator

#### Related Topics:

120 people viewed this question

#### Top Texas Instruments Office Equipment & Supplies Experts

##### Ekse

Level 3 Expert