Your calculator manual is the best reference. It contains worked out examples and sample screen views, as well as a complete index of features and actions. A new manual, either hard copy or electronic version, is available from Texas Instruments. Most of the instructions also apply to the **TI-83 Plus**.

Calculator key strokes are shown in brown: *ON*

Features that appear above the keys have the complete key sequence in brackets:
*OFF* [ *2nd ON* ]

Alpha characters (letters) appear in turquoise above many keys. For example, to access the character "A", press

[ *ALPHA MATH* ]

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Turn calculator on: *ON*

Turn calculator off: *OFF* [ *2nd ON* ]

Stop an ongoing process: *ON*

All calculations are done on the home screen.

Get to home screen: *QUIT* [ *2nd MODE* ]

4+5 : *4 + 5 ENTER*

5^{2} : *5 x ^{2} ENTER*

5

Clear the home screen:

Some keys add an opening parenthesis, which you decide when to close.

:

:

Darken (lighten) the display: repeatedly press

Move around: use the four arrow keys

Select an item: press the number next to the item, or move the cursor there and press *ENTER*

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Once you enter a function you can graph it, put values into a table, and do calculations with the function name. The keys to manipulate functions are at the top, just under the display window.

Enter a function formula: *Y=*

Example: to define the function *y = 3x+2* as the function Y_{3} use the down arrow key to place the cursor next to Y_{3}= and type as follows:
*3 + 2*

The key which produces the variable X in this example will produce other variables when the calculator is in different modes.

Graph a function: *GRAPH*

Adjust the graph window: *WINDOW*

Turn the graph of a defined function off or on:
*Y=* Place the cursor on the = sign, press *ENTER*

Table of function values: *TABLE* [ *2nd GRAPH* ]

Adjust values shown by table: use the arrow keys to scroll up and down, or

*TBLSET* [ *2nd WINDOW* ]

Access the function name Y_{3}: *VARS* Y-VARS *1 3*

The name will be printed at the last cursor position.

Clear a function definition: *Y=* Place the cursor on the formula, press *CLEAR*

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You can do some calculations from the graphing screen.

Get a cursor to follow a graph: *TRACE* and use the right and left arrow keys. Watch the values at the bottom of the screen.

Move the cursor among several functions on the screen: Use the up and down arrow keys.

Zoom in: first *TRACE* and place the cursor where you want the center of the new graph to be. Press
*ZOOM 2 ENTER*

The same Zoom menu contains a zoom out feature, as well as useful standardized axes.

Find x-intercept of graph: *CALC 2* [ *2nd TRACE 2* ]

You will be prompted for bounds and a guess, which you type on the number keypad and then press *ENTER* each time. The left bound should be to the left of a visible intercept, the right bound to the right, and the guess in between the two bounds. The (approximate) intercept appears at the bottom of the screen.

There are other calculations on the *CALC* menu, including minimum, maximum, derivative, definite integral, and intersection of two graphs.

Access matrix names: *MATRX*

TI-83 Plus: *MATRIX* [ *2nd x^{-1}* ]

Enter the matrix :

Do a matrix calculation: access the matrix name and press the corresponding number. Complete the calculation.

Example: assume you called the above matrix A. To calculate 3A, press

Square matrices sometimes have inverses. To find B

Find the row-reduced echelon form of A:

If a matrix is too large to fit completely on the home screen, use the arrow keys to see more columns or rows.

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Get in sequence mode: *MODE*, use the arrows to highlight Seq, press *ENTER*.

Check the formatting: *FORMAT* [ *2nd ZOOM* ], use the arrows to highlight Time, press *ENTER*.

Enter a closed-form sequence: *Y=*

Example: to define the sequence *a _{n}* = 1/

Then place the cursor next to u(

Enter a recursive sequence:

Example: to define the sequence

Place the cursor next to u(

Place the cursor next to u(

This sequence should read

Table of sequence terms: Adjust table values first (below)!

Adjust values shown by table:

Make sure TblStart =

Graph sequence values: Adjust

Access the sequence name u:

The name will be printed at the last cursor position.

Clear a sequence definition:

Enter a series:

Example: to enter the series , enter the following values:

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Enter data in lists: *STAT* then choose EDIT.

Clear a list: *STAT* EDIT, use the up arrow to place the cursor on the list name, press
*CLEAR ENTER*

**
Warning!
**
Pressing the *DEL* key instead of *CLEAR* will delete the list from the calculator. You can get it back with the *INS* key. See Insert a new list below.

List name: there are six built-in lists, L_{1} through L_{6}, and you can add more with your own names.

To access the built-in list L_{1}: *L _{1}*
[

Insert a new list:

Type the name of a list: use the alpha character keys. The ALPHA key is locked down for you. Press

Make values in list L

Prepare to graph list values:

Press a plot number, move the cursor to On, and press

Make sure the list names you want appear opposite Xlist: and Ylist:

Set the

Graph list values:

Both list graphs and function graphs can be turned on and off in the function menu:

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To access the built-in list L_{1}: *L _{1}* [

Calculate a linear regression with x = L

Calculate a linear regression with x = L

Show the values of

Start from the home screen.

Select DiagnosticOn from

Press

It should say DONE.

Now every time you do a regression,

Quadratic, Cubic, Exponential, and other regressions are available on the

Calculate statistics from list L

Calculate statistics from list L

Use the down and up arrows to scroll through all the statistics.

To access statistical distributions:

Example: if a normal distribution has mean 10 and standard deviation 2, and you want the probability that a sample will be between 7 and 9, press

Note the commas.

Get in complex number mode: *MODE* then choose a+b*i*.

Access *i*: * i* [

Use

To convert the current number on the screen to a fraction:

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Store the last number appearing on the home screen: *STO A ENTER* [ *STO ALPHA MATH ENTER* ]

The number is now in storage location A. There are 27 different storage locations, one for each letter (!)

Use a previously stored number from register A: *A* [ *ALPHA MATH* ]

If you're in the home screen and not sure of the value in register A, you can "recall" the value in A, giving you a chance to delete that part of the calculation and try again:
*RCL A ENTER* [ *2nd STO ALPHA MATH ENTER* ]

Example: store the number 5 in register A. Then try both of these sequences:

*3 + A ENTER*[*3 + ALPHA MATH ENTER*]*3 + RCL A ENTER ENTER*[*3 + 2nd STO ALPHA MATH ENTER ENTER*]

Only change these settings for special purposes. The usual settings are: Normal, Float, Radian (for calculus) or Degree (for noncalculus courses), Func, Connected, Sequential, Real, Full.

Press *MODE*

Only change these settings for special purposes. The usual settings are the first choices in each row:: RectGC, CoordOn, GridOff, AxesOn, LabelOff, ExprOn. In sequence mode (*MODE* Seq), the usual setting for the first row is Time.

Press *FORMAT* [ *2nd ZOOM* ]

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