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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Posted on Jan 02, 2017

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Try it out on some equations to make sure it is working like you expect it to work.

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What is the graph linear equation for y=2*+1


Now is the equation supposed to be y=2x+1? If so,
graph-linear-equation-y-2-1-cds52kcxe0my5labvj2rkild-2-0.gif
The graph of y = 2x+1 is a straight line
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HOW I CAN HAVE OUTPUT FRO AUDIO LINE ROM LG 55LH5000???


Hi, sorry but Most LG's no longer have audio outputs. The easiest way to get it ,You need to take the audio output from the source i.e. "cable box output"..if you have of course...
However whether your TV has this output or not we need to make some tests..5 different connections possibilities provided below.
(not by priority..you can start with any of it ).Below ,there is a sample TV back panel picture as well
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( This is the last ditch solution , since it mutes the whole sound.) ..
NOTE: if you connect this, pls be careful,your TV voice level will drive the stereo volume....

Hope this helps!..if more help requires Would you please let me know the result ?
Take care and please
Remember to rate/vote and give me 4 Thumbs Up for us
to continue f
or Helping out the Community :)


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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.

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1 Answer

Good morning! I wish to plug our television into the LBT-ZX6 stereo, but the TV's output uses an optical audio cable. Is there an adapter of any sort that could convert the optical cable into the stereo...


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Most local electronics stores will sell these. Radioshack is a good example. Also, you could look around on the internet.

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For instance if I have a problem of 4x+1-x=2x-13+5. how do I enter it in my T E to find wha is X


Hi,
This calculator does not have a Solve function or a solver. However this example of yours is very simple that you can do it by hand. If you do not mind I will show you how to solve it. Not everything needs a calculator.
You want to solve for x. OK
  1. Start by gathering similar terms 4x-x =3x; -13+5 =-8
  2. Rewrite your equation as 3x+1=2x-8
  3. Make the +1 change side while changing its sign
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  5. Make +2x on the Right hand side go to the left hand side, changing its sign in the process 4x-2x=-9 or 2x=-9
  6. Divide both members by 2. This gives
  7. x=-9/2 or -4.5 if a decimal result is required.
Hope it helps.


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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;
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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.
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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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