Question about Texas Instruments TI-89 Calculator

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I was ablto to solve for zeros in my ti-89, but know it will not

It gives me blank answers. Also when I type x as a variable it will not do it. Help!!!!

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Type: F2,1,12=2x+4,x)
You should see: solve(12=2x+4,x) x=4
you need to make sure that there is an '=' and then you need to type ',x' at the end.

Posted on Mar 14, 2009

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Solve() gives me wrong answer. -20^2=12^2+2X(-5-3). The answer is -16, But my TI-89 is giving me 34 during the solve funtion. my TI-83 is also giving me -20^2=-400 not 400.

Enter the first term as (-20^2), not as -20^2. Without the parentheses the calculator interprets it as
-(20^2), which is not what you want.

Also, make sure you use the (-) key just to the right of the decimal point and not the - key.

Aug 31, 2011 | Texas Instruments TI-89 Calculator

1 Answer

I want to know how to solve the Cubic equation on TI-89 Calculator

There are a lot of ways to do it. One is to write a program using the cubic formula. If you just want the roots, use the solve() or zeros() functions.

For example, to find the zeros of x^2-6x^2+11x-6, enter

Note that solve() has "=0" in it while zeros() does not.

solve() will give you an answer of
x=1 or x=2 or x=3
while zeros will give you an answer of
{1 2 3}
which plainly are the same thing, just expressed differently.

May 09, 2011 | Texas Instruments TI-89 Calculator

1 Answer

Does anyone know how to clear the number stored for the x-variable on the TI-86? Thank you for any help you can give.

Que Pasa Cassandra,

Even though I don't own a TI-86, I do have a TI-83 and a TI-89 Titanium and I will offer you a few suggestions.

Find X [it could be categorized under EXPR - expressions]
Delete X

The TI-86 may have the "Delvar" code available for the main screen; If so:
Type X

The TI-86 might have all the variables default to a value of zero; if so, then deleting a variable would have the same effect as zeroing it out. So; this would be easy:
Type 0
Type X

To check if your TI-86 does indeed stores values of zero for all unused variables just type in a variable that you haven't used, hit enter, and see whether or not the calculator returns 0 or the letter. If it returns zero then suggestion three will work. If it returns the letter then you will need either suggestion one or suggestion two.

I hope that helped.


The Math Cheetah

Mar 14, 2011 | Texas Instruments TI-86 Calculator

1 Answer

TI 89 when solving equations or integrating a message appears:

With the ALPHA keyboard, Type in the NewProb command and press ]ENTER] It resets the one-letter variables to their default status.
Alternatively, you can use the CATALOG of commands to launch the NewProb command.
Another way is
In HOME directory, press the [2nd][F1] to activate the F6 key. In the menu list, press 1:Clear a-z and ]ENTER].
If you have to use the variable x multiplied by a function (sin, cos, tan, log, etc) do not used implied multiplication: enter the [*] explicitly.

Apr 14, 2010 | Texas Instruments TI-89 Calculator

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Does a TI 89 have an advantage over a TI 84 in a 10th grade algebra class? My sons teacher won't let him use an 89. He says it does too much of the work for him. Is this right?

the 89 is in my opinion not need/ approriate for a 10th grade algebra class, or worth the extra money.

for example the 84 wont output variables it must output a number

so your son may be doing factoring, if he inserts (x^2+2x+1) the 89 will allow him to enter it and factor it as (x+1)(x+1) or (x+1)^2 the 84 will not.

the 84 will do pleanty as far as graphing, finding zeros,plotting, calculations, and should get him any answer that he seeks so long that he knows how to use the 84. It just wont give him the intermediate steps the the 89 is able to give.

hope this helps

Apr 05, 2010 | Texas Instruments TI-84 Plus Calculator

1 Answer

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

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

Sep 29, 2009 | Texas Instruments TI-89 Calculator

2 Answers

Steps in solving matrix on my ti 89 calculator.

I assume you are speaking of solving a system of equations with a number of unknowns. If not, please correct me. Here's an example in practice:

If you have a system of 3 equations with 3 unknowns, you would set up your matrix so that the coefficients of each variable for a particular equation are on one row. So, given equations x + y + z = 0, 2x + 3y - 4z = 1, x + -z = -1 you would type the following into your calculator: [[1,1,1,0][2,3,-4,1][1,0,-1,-1]] and press enter to make sure you typed it correctly. notice that in the third row there is a zero, since we have zero time y for the third equation. Then row-reduce the matrix (2nd > 5 > 4 > 4 or in the CATALOG as rref). You should get out the matrix [[1,0,0,-1][0,1,0,1][0,0,1,0]]. This says that x=-1 y = 1 z=0 since my first column contained the coefficients for the x variable, the second for the y variable, and the third for the z variable. The last column contains the solution, the part on the other side of the equals sign.

Hope this helps! For more reading (from someone else; I just made this one up), check out the Wikipedia articles on Gaussian elimination and Systems of linear equations

May 03, 2009 | Texas Instruments TI-84 Plus Calculator

1 Answer

Can you Factor on a TI-84? IF not, does the TI-89?

Well, to answer part of your question, yes... the TI-89 does factor like this. it is inputted like this:


Check the catalog in the TI-84 (which is 2nd-zero) and look under F for factor()

Jan 12, 2009 | Texas Instruments TI-89 Calculator

1 Answer

Plz help

Try not to set your first variable as zero
thats not a lot but thats what happened to me in my class

Jul 17, 2008 | Texas Instruments TI-89 Calculator

2 Answers

Solving multiple non-linear equations

Type it like this: solve( equation1 and equation2 and moreEquations, {list of variables to solve for})

Put all of your equations right after the opening parenthesis separated by the word and, then a comma, then within curly braces each variable you want to solve for each separated by a comma.

Apr 26, 2008 | Texas Instruments TI-89 Calculator

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