Question about Texas Instruments TI-89 Calculator

2 Answers

Variables not appearing in differentiation and integration

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

also, if I integrate:
S(x,x)
it outputs
".5"
instead of x^2/2

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2 Answers

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  • Contributor
  • 6 Answers

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

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  • Contributor
  • 3 Answers

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

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1 Answer

Examples of homogeneous differential equation


Hi janeth sabay,

 

Have a good day!!

 

Here is your needed example for Homogenous differential equation:

 

The equation 49e8abf8a1c5be91fadbf33a5405bdc3.gif is said to be homogeneous if P and Q are homogeneous functions of x and y of the same degree.

cc966bdc4bb845d781e46c1ccf986b02.gif(1)

We can test to see whether this first order equation is homogeneous by substituting 21fe29cd49ecbd3abe2ae6373e89eab6.gif . 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 1:19c981882c1f9b05fadf586b56a931bc.gif(2)

d8be3b3ee65102c9f51076f6fbf371a4.gif(3)

There are no terms in x on the right hand side and the equation is Homogereous.Example 2:72f80f87eb510a9e0fd81c423b3faa55.gif(4)

b8821dedcc10e7738d072f6f0e2b7585.gif(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:

fa23f299c6866eb1139d14429d91ce12.gif(6)

Putting y - vx

Since y is a function of x so is v

d362aad60b6e62347861fab3ab05ab83.gif(7)

e347d11784544bf8765eda8bd3aa2157.gif(8)

a058b0c3fd22a3f41faff3969f8e09ba.gif(9)

Separating the variables

06861c9f37042cd1ac9880600c5136b1.gif(10)

Integrating

eb1052106ddf0671b3ee898bce2279c8.gif(11)

0afc28b1b4e13dbe09c308d107327207.gif(12)

Substituting (12) in equation (10)

405d0e82aab0e4cb688a90b92a0dab77.gifI can suugest you also to visit this site for more examples http://www.codecogs.com/reference/maths/differential_equations/homogeneous_differential_equations.php

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2 Answers

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


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

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2 Answers

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


Here is an example. Instead of SIN(X) insert your polynomials.

The syntax of the command is
4aa123f.jpg
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
18c49ac.jpg
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.

k24674_76.jpg

May 28, 2011 | Casio FX-115ES Scientific Calculator

1 Answer

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    How to find derivatives using fx115-es


    The syntax of the command is
    4aa123f.jpg
    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
    18c49ac.jpg
    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

    1 Answer

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


    The syntax of the command is
    4aa123f.jpg
    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
    18c49ac.jpg
    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

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    1 Answer

    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
    1. Press the Menu button.
    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.
    3480e51.jpg

    2c6abb7.jpg

    a448228.jpg

    cc402d5.jpg

    For the numerical integration
    Select Calculus (see above)>Numerical Integration>ENTER.
    Type in your integral using the template. Here is the procedure illustrated.

    e9470c8.jpg

    96cff2c.jpg



    May 28, 2010 | Texas Instruments TI-Nspire Graphic...

    1 Answer

    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

    2 Answers

    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 b8325f5.jpg;
    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.
    2. Enter your function;
    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).


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    1 Answer

    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.

    8d787a6.jpg 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

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