Question about Texas Instruments TI-84 Plus Calculator

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Everything i enter in my calculator barely shows up on my screen

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This seems like a problem with the calculators contrast; Here's what to do:
Press the 2nd and up key. This should darken the characters.
If that does not work; it could be that the battereies are almost exhausted and need to be replaced. In the event you replace the batteries and the screen is then too dark simply press the 2nd and down keys to readjust it.
Happy Calculating

Posted on Aug 28, 2010

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Dark screen


If calculator uses batteries, change the batteries. If it uses solar polar, expose it to direct sunlight or a powerful artificial light (lamp).
Also , in the Mode or Setup menu look for a contrast setting procedure. If nothing works, just buy another calculator and retire this one to the museum of calculators.

Nov 23, 2013 | Sharp EL-501WBBK Scientific Calculator,...

1 Answer

TI-81 when turned on, screen is totally black, can perform calculations & barely see results on screen. is this a battery problem?


Adjust the screen contrast. Turn the calculator on. Press and release the 2nd key. Press and hold the down-arrow key to lighten the screen. If you go too far, use the 2nd and up-arrow keys to darken it.

Aug 08, 2012 | Texas Instruments TI-81 Calculator

1 Answer

The words and numbers that show up on the screen are really hard to make out. They are really light and barely noticable.


Adjust the screen contrast. Turn the calculator on. Press and release the 2ND key, then press and hold the up-arrow key for a couple of seconds to darken the screen. If you go too far, repeat the process using the 2ND and down-arrow keys.

Feb 09, 2011 | Texas Instruments TI-83 Plus Calculator

1 Answer

How do I find the determinant of a matrix?


Here is a detailed account of how to calculate the determinant of a square matrix.

I assume you know how to define your matrix, but I will repeat it here for others who might not know. You can skip to Calculation
1.Turn Calculator ON. If there are no icons, press [MENU].

Data Entry

2.Use arrows to highlight [MAT] icon. Press [ENTER]
3.Highlight the first line where it says Mat A. Use the right arrow to enter the dimensions of Matrix A. Enter 3 and press [EXE]. The cursor moves to the second dimension. Press 3 and press [ENTER].
4. The matrix entry screen appears.
5. Enter first matrix coefficient a_11 and press [ENTER]
6. Enter a_12 and [ENTER]
.....
Key in last coefficient a_33 and press [ENTER]

Calculation
Press [MENU] and [RUN]
Press [OPTN][F2:MAT][F3:Det] Command echoes on screen as det
Press [F1:Mat] echoes on screen as Mat; screen shows det Mat
Press [ALPHA] A The screen displays det Mat A
Press [ENTER] to calculate the determinant.

If the matrix is not square, you cannot calculate its determinant.

Jan 03, 2011 | Casio FX-9750GPlus Calculator

1 Answer

When i click the F2 and F3 it doesn't show MAT or Det...?


When you press the OPTN key you see Tabs at the bottom of the screen. The second one from the left should be the submenu for matrix operations.. When you press F2:MAT, the new tabs are Mat, M>L (Matrix to List), det (command to calculate the determinant etc.

Here is a detailed account of how to calculate the determinant of a square matrix.

I assume you know how to define your matrix, but I will repeat it here for others who might not know. You can skip to Calculation
1.Turn Calculator ON. If there are no icons, press [MENU].

Data Entry

2.Use arrows to highlight [MAT] icon. Press [ENTER]
3.Highlight the first line where it says Mat A. Use the right arrow to enter the dimensions of Matrix A. Enter 3 and press [EXE]. The cursor moves to the second dimension. Press 3 and press [ENTER].
4. The matrix entry screen appears.
5. Enter first matrix coefficient a_11 and press [ENTER]
6. Enter a_12 and [ENTER]
.....
Key in last coefficient a_33 and press [ENTER]

Calculation
Press [MENU] and [RUN]
Press [OPTN][F2:MAT][F3:Det] Command echoes on screen as det
Press [F1:Mat] echoes on screen as Mat; screen shows det Mat
Press [ALPHA] A The screen displays det Mat A
Press [ENTER] to calculate the determinant.

If the matrix is not square, you cannot calculate its determinant.

Dec 13, 2010 | Casio FX-9750GPlus Calculator

1 Answer

When I type a problem into the TI84 it will give me the answer with an Error. Example, I type in 2+2 and get 4E0. This happens with everything I enter into the calculator. How to I fix this?


Sorry, but it takes sometime to be well familiar with the calculator. The E in the result is a short-hand notation for times 10 to a power. What you got is 4x10^(0) which is just 4.
Your calculator is doing that because it is configured to display result in SCIENTIFIC format.
To revert to the format you may be more accustomed to,
  1. Press the [MODE] key
  2. The first line of the displayed screen will show NORMAL SCI ENG and the cursor blinking on SCI or ENG.
  3. Use the left arrow to highlight NORMAL and press ENTER.
  4. Press [2nd][MODE] to (QUIT) and go to main calculator screen.

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

1 Answer

How do I find degrees minutes and seconds on my ti 84 plus?


On this family of calculators, you do as follows
  1. Enter the first number (degrees), ex:15
  2. Press [2nd][APPS] (ANGLE) to access the Angle functions
  3. Select [1: degree symbol] [ENTER]
  4. Main screen shows 15 deg
  5. Enter the minutes, ex 25
  6. Press [2nd] [APPS](ANGLE) to access Angle functions
  7. Select [2:' apostrophe] [ENTER]
  8. Screen echoes 15 deg 25'
  9. Enter the seconds number, ex 32
  10. Press [ALPHA][+] (") to access the double quotation mark.
  11. Screen echoes 15 deg 25' 32"
  12. Press [ENTER]
  13. Calculator converts this in decimal degrees 15.42555556

To convert this back to DMS, press [ANGLE][|=>DMS][ENTER] and the calculator displays the original value 15 deg 25' 32"

Jan 11, 2010 | Texas Instruments TI-84 Plus Calculator

1 Answer

I am trying to graph to evaluate each expression. how could i do it on the calculator(ti-83) a:(f+g)(0) b)(f-g)(-1) c)(fg)(1) (d)(f/g)(3()


Let us see if I understand what you want to do. You have two functions f and g. With f and g you create four functions,
  1. f+g, which you want to evaluate at 0
  2. f-g, which you want to evaluate at -1
  3. f*g, which you want to evaluate at 1
  4. and f/g, which you want to evaluate at 3
If that is not what you intend to do, then I am sorry to I that interpreted incorrectly and you will have to post a comment with more information.
If however I did understand what you want to do, then there is a simple way to achieve this
  1. In the [Y=] function editor, enter Y1 and Y2
  2. In your mind decide which one represents f(x) and which represents g(x), probably f(x)=Y1(x) and g(x)= Y2(x)
  3. Validate each one by pressing [ENTER]
  4. Do not worry about graphing the function.
  5. Press [2nd][QUIT] to return to main calculator screen
  6. Enter a value (for example 5) and store it in variable X; to do so you press 5 [STO->][X,T, theta,n] [ENTER]
  7. To calculate f(x)+g(x) or (f+g)(x) on the command line in main calculator screen
  • Press [VARS][=>][Y-VARS][1:Function][1:Y1][ENTER]. Main calculator screen echoes Y1
  • Press [+]. Screen shows Y1+
  • Press [VARS][=>][Y-VARS][1:Function][1:Y2][ENTER]. Main calculator screen echoes Y1+Y2
  • Press [ENTER] to obtain the value of f+g at X=5
As you can see, if you want a different operation f-g, f*g, or f`/g for a different value of X, you will have to repeat steps 6 and 7.

I am going to show you how to create a small program that will perform all the 4 operations in sequence, each time asking you for the value of X you want to use. If you are not interested, you can ignore what follows. I remain convinced that it will be helpful for other visitors.

Creating a simple program

Press [PRGM]
Use arrow to highlight [NEW]
Press [ENTER]
Screen displays
PROGRAM
Name= with alpha cursor blinking
Type in the name, for example FOPG ( meaning F operation G) or anything else. Do not use a keyword (reserved command of the TI84Plus) These are what you find in the [CATALOG].

ddae385.jpgac147eb.jpg

The top line on each screen capture is inserted by the program editor after you choose the name. The last line of first screen is the the same line as the second line on 2nd screen. It must not be entered. The colon : is supplied by the program editor. It is the beginning of an instruction.

There are only to commands that are repeated here: Disp and Prompt

Disp orders the program to display
  1. a message (what is between the quotation marks) or
  2. the result of a calculation: Y1+Y2, Y1-Y2, Y1*Y2, or Y1/Y2
Prompt X will display X=? and the blinking cursor. You are supposed to enter the desired value of X and press [ENTER].
The Disp and Prompt command are accessed through the command catalog by pressing [2nd][0] (CATALOG) then scrolling along the list of commands to find the one needed. Shortcuts are possible (see below)

How to key in the program steps within the program editor
: Disp "F+G"

Press [2nd][0] (CATALOG) [X^-1](D) [Scroll Down [till...] Disp
Press [ENTER]. Editor shows :Disp
Press [ALPHA] [+] ("). Editor shows :Disp "
Press [ALPHA][COS] (F). Editor shows :Disp "F
Press [+]. Editor shows :Disp "F+
Press [ALPHA][TAN] (G). Editor shows :Disp "F+G
Press [ALPHA][+] (") Editor shows :Disp "F+G"
Press [ENTER] to validate instruction
Calculator inserts a new line :

: Disp Y1+Y2
Press [2nd][0] (CATALOG) [X^-1](D) [Scroll Down [till...] Disp
Press [ENTER]. Editor shows :Disp
Press [VARS][=>][Y-VARS][1:Function][1:Y1][ENTER]. Editor shows :Disp Y1
Press [+] . Editor shows :Disp Y1+
Press [VARS][=>][Y-VARS][1:Function][1:Y2][ENTER]. Editor shows :Disp Y1+Y2
Press {ENTER] to validate instruction
Editor inserts a new line :


:Prompt X
Press [2nd][0] (CATALOG) [8](P) [Scroll Down [till...] Prompt
Press [ENTER]. Editor shows :Prompt
Press [X,T.theta,n] key. Editor shows :Prompt X
Press [ENTER] to validate instruction
Editor inserts a new line :

To save program
Once all instructions are entered, press [2nd][QUIT] to save program.

To run program


  1. Press [PRGM]
  2. Under the [EXEC] menu, the list of available programs appears.
  3. Type the number corresponding to the one you want to run ( FOPG) and press [ENTER].
  4. The main calculator screen displays prgmFOPG and blinking cursor.
  5. Press [ENTER] to make it run
  6. Enter a value of X and press [ENTER]
  7. Follow instructions.

Dec 21, 2009 | Texas Instruments TI-84 Plus Calculator

1 Answer

ERROR MEMORY


Hello,
Open the HOME application (main calculator window). Press [2nd][MEM].
An exemple of what you see.

ab75ca1.jpg


Everything in the list can be erased except System, FlashApp, Archive.
Even FlashApp and Archive can be erased if you so choose.

By Pressing F1 in that screen you you can select 1: Ram then 1: All Ram as in following picture.

4753ef7.jpg

Here is what it looks like after I say OK in previous screen.

0c7e635.jpg

History contains all the commands I executed from the command line. To erase the history, I return to Home screen, press [2nd][CATALOG] and use scroll key (arrow key) to reach the Clear Commands. They all start with Clr. Select ClrHome and press {ENTER][ENTER]
8f3d5f2.jpg
Here what I get when I execute the command.

0aaeda2.jpg
As you can see the history has been erased.
Why do I take all these precautions: because I do not know what kind of precious data and apps you have.

I will now show you the amount of space the an app can take.
In Home screen press [2nd][Var-Link] then [2nd][F7:FashApps].
On the next screen there are two FlashApps, each with the number of bytes it occupies. You can now select one of the Apps that you do not need (as Polynomial here),
0c5d030.jpg
Then press F1 and select delete and press ENTER.
56ebdac.jpg

This shows you the steps you follow if you do not want to erase everything. The next picture shows you a more radical way to erase things. You will be asked to confirm the deletion. Once you say yes, there is no way to restore anything unless you transfert the Apps again the calculator.

Now you are on your own. Before you confirm an operation by pressing ENTER/YES, make sure that that is what you want. Once something is erased , it is erased for good. There is no unerase command.

Good Luck


Oct 28, 2009 | Texas Instruments TI-89 Calculator

1 Answer

Display is so light that I can barely read it, I've replaced the batteries and no change


Have you attempted darkening the display on the calculator through the function keys? Push "2nd" and then push "up" a few times. After resetting the calculator, this setting will always revert to a lower, unreadable setting. I'm sure TI knows about this, but they probably arent too inclined to fix it.

Jun 04, 2007 | Texas Instruments TI-83 Plus Calculator

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