Question about Texas Instruments TI-84 Plus Calculator

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On the TI-84 Calculator I can't find the = symbol. Not the enter key to find the answer to a simple equations. But if I were to use the Solve(...) option in the Catalog I can't because I can not find the = symbol anywhere. For instance if i wanted to solve for x: 2(x+3)=4xsquared or something (i know its easy to do that by hand, but i'm working with harder equations. Anyone know where the = symbol is????

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Hello,
Since you know about the catalog, that is where you find the equal sign, near the bottom of the list. It is faster if you scroll up from abs(.
Hope it helps.

Posted on Oct 07, 2009

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1 Answer

When typing 3(radical symbol)10ab * 4(radical symbol)14ab ... then press enter it comes out to a decimal. How do I enter the equation into calculator to show the answer as a radical?


I am afraid you cannot do that with the TI83/84 Plus SE. The newer OS allows you to get results expressed as fractions, but not radicals. Sorry.

Nov 11, 2012 | Texas Instruments TI-84 Plus Silver...

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Equations


You can't simply enter 7x+9=30 into the calculator, there is a way to calculate what the x is but its been a few years since I've done these..

Oct 03, 2008 | Texas Instruments TI-83 Plus Calculator

1 Answer

When typing 3(radical symbol)10ab * 4(radical symbol)14ab ... then press enter it comes out to a decimal. How do I enter the equation into calculator show show the answer as a radical?


I am afraid you cannot do that with the TI83/84 Plus SE. The newer OS allows you to get results expressed as fractions, but not radicals. Sorry.
Your question seems to imply that you can do algebra with this calculator but that is impossible, unless you stored numerical values in variables a and b. In that case that is not doing algebra.

Nov 11, 2012 | Texas Instruments TI-84 Plus Calculator

1 Answer

2c + 6 + 7c = 8


To solve this with a ti-84 press [math] and select solve from the menu. This will open the equation solver. Type in your equation
(Note: you may need to put it in the form with 0=, So the equation would be 0 = 2c + 6 +7c - 8 ). Then press
enter or arrow down button.

Mar 30, 2011 | Texas Instruments TI-84 Plus Calculator

1 Answer

5/4x-18=-3 Ti 84 plus One: just press enter/solve Two: press 2nd Test (Math) then press enter Every time I put in and equation using the above method for the equal sign. it either takes me back to...


If you wan to solve an equation using the SOLVE feature you enter it as follows (your example)
You should rewrite it as 5/4*X-18+3 (= 0). Implicitly, the calculator assumes that the right side is ZERO and you do not enter any right side nor an equal sign.
Type in
5/4 [*] [X,T,theta, n] -18 +3 [ALPHA] [ENTER] (SOLVE)
You should get an answer -780/47 or the decimal equivalent (depending on display mode.)

Feb 12, 2011 | Texas Instruments TI-84 Plus Calculator

1 Answer

-5(n-2)=4(2n+3) put in ti 89 how?


To enter this equation on a TI89Titanium is rather trivial: You use the keyboard and the [ALPHA] key to enter the variable (or unknown) n.
The question I am asking you is this: "What do you intend to do with the equation once it is entered?"

As you can see on the screen capture I am enclosing, if you just want to enter it and if n does contain a value already, all the calculator will do is to echo the command without modification. Obviously this is not what you want.

The screen capture shows you two other commands you can use solve( and expand (.
35fffed.jpg

That should answer your question concerning how to enter the equation (look at the command line) and maybe help you decide what you want to do with the equation once it is entered.

Jan 25, 2010 | Texas Instruments TI-84 Plus Calculator

1 Answer

How do I solve a polynomial equation: x^4+5x^3-3x^2-43x-60 on a TI-83 plus graphing calculator?


Hello,

Sorry, but what you wrote is not an equation but a polynomial expression. You want to solve the equation x^4+5x^3-3x^2-43x-60 =0.

The solve( command, can only be used with real numbers.
The solve( is available through the CATALOG : [2nd][CATALOG], scroll down till you reach the command. Highlight it and press [ENTER]. The command echodes on main screen as solve( .
You complete the command by entering the expression (not the equation), the name of the variable you solve for, the initial guess , and { lower limit, upper limit} between curly brackets, and the closing parenthesis.
Exemple:
solve (x^4+5x^3-3x^2-43x-60 , x,0 {-5,0} ) [ENTER]
should give you the negative root,
solve (x^4+5x^3-3x^2-43x-60 , x,0 {0,5} ) [ENTER]
should give you the positive root.

It is implied that the expression is 0, so you should not insert =0, otherwise you get an error. Here for the lower limit is -5 you must use the change sign symbol (-) under the 3 key, not the regular MINUS.

You may ask how I knew that there were two roots when the equation is a quartic? By first graphing it to have an idea about where the roots lie and how many there are. You should always do that to speed up the search.

There is another way to zoom in on the roots: by drawing the graph and using the tools accessible under the [2nd][CALC] menu, namely the option [2:Zero]
The resolution of the TI83/84 is not good enough for this function that grows too fast, but I am inserting a picture of the curve from another calculator with a much better resolution.

56ccf66.jpg

Hope it helps.


Oct 18, 2009 | Texas Instruments TI-83 Plus Calculator

2 Answers

How do i solve this problem 3x+25=5x using my TI 84 plus


i think there are programs but with something as simple as that you should be able to work it out manually....
3x+25-5x=5x-5x
-2x+25-25=0-25
-2x=-25
x=25/2 or 12.5

Jul 05, 2009 | Texas Instruments TI-84 Plus Calculator

3 Answers

My calculator will only graph one graph at a time.


This is simple... Back up all RAM, (press second+, then 2, then 1, press enter to back up something if backed up it will have a star by it) Then clear your RAM (pull out your batteries while the calc is still on or press second+, then 7, then 1)
Hope this helps!

Oct 07, 2008 | Texas Instruments TI-84 Plus Calculator

2 Answers

Graphing


The first solution will allow you to watch your calculator graph two equations simultaneously rather than finishing one before graphing the next; it won't solve the problem of having the calculator unselect one equation when you select a second. To fix that problem, try the following:


In order to select additional graphs, the Transformation Graphing App will need to be uninstalled from the TI-83 Plus Family and TI-84 Plus Family. Uninstalling the App does not erase it from the calculator, it disables it from interfering with the normal graphing modes. Below are the steps to successfully uninstall the App.
  • Press [APPS] key
  • Select Transfrm from the menu
  • Press 1:Uninstall
The illustration and solution are courtesy of Jesse Phillips, who cites this page from the Texas Instruments support site

- doug garfinkel, Children's Day School

Jan 15, 2008 | Texas Instruments TI-84 Plus Silver...

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