Texas Instruments Plus TI-84 User Manual
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TI-84Plus Silver Edition


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USA FCC Information Concerning Radio Frequency


This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation.

If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, you can try to correct the interference by one or more of the following measures:

Reorient or relocate the receiving antenna.

Increase the separation between the equipment and receiver.

Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

Consult the dealer or an experienced radio/television technician for help.

Caution: Any changes or modifications to this equipment not expressly approved by Texas Instruments may void your authority to operate the equipment.


Chapter 1:

Operating the TI-84Plus Silver Edition

Documentation Conventions

In the body of this guidebook, TI-84Plus refers to theTI-84Plus Silver Edition. Sometimes, as in Chapter 19, the full nameTI-84Plus Silver Edition is used to distinguish it from theTI-84Plus.

All the instructions and examples in this guidebook also work for the TI-84Plus. All the functions of theTI-84Plus Silver Edition and theTI-84Plus are the same. The two graphing calculators differ only in available RAM memory, interchangeable faceplates, and Flash application ROM memory.

TI-84Plus Keyboard

Generally, the keyboard is divided into these zones: graphing keys, editing keys, advanced function keys, and scientific calculator keys.

Keyboard Zones

Graphing — Graphing keys access the interactive graphing features.

Editing — Editing keys allow you to edit expressions and values.

Advanced — Advanced function keys display menus that access the advanced functions.

Chapter 1: Operating the TI-84Plus Silver Edition


Scientific — Scientific calculator keys access the capabilities of a standard scientific calculator.


Graphing Keys

Editing Keys


Function Keys


Calculator Keys

Chapter 1: Operating the TI-84Plus Silver Edition


Using the Color.Coded Keyboard

The keys on the TI-84Plus arecolor-codedto help you easily locate the key you need.

The light colored keys are the number keys. The light gray keys along the right side of the keyboard are the common math functions. The light gray keys across the top set up and display graphs. The Œkey with the purple lettering provides access to applications such as the Inequality Graphing application.

The primary function of each key is printed on the keys. For example, when you press, the MATH menu is displayed.

Using the y andƒ Keys

The secondary function of each key is printed in blue above the key. When you press the blue ykey, the character, abbreviation, or word printed in blue above the other keys becomes active for the next keystroke. For example, when you pressyand then

, the TEST menu is displayed. This guidebook describes this keystroke combination asy:.

The alpha function of each key is printed in green above the key. When you press the green ƒ key, the alpha character printed in green above the other keys becomes active for the next keystroke. For example, when you pressƒand then , the letterA is entered. This guidebook describes this keystroke combination asƒ [A].

Chapter 1: Operating the TI-84Plus Silver Edition


The ykey accesses the second function printed in blue above each key.

The ƒkey accesses the alpha

function printed in green above each


Turning On and Turning Off the TI-84Plus

Turning On the Graphing Calculator

To turn on the TI-84Plus, pressÉ.

If you previously had turned off the graphing calculator by pressing yM, theTI-84Plus displays the home screen as it was when you last used it and clears any error.

Chapter 1: Operating the TI-84Plus Silver Edition


If Automatic Power Down™ (APD™) had previously turned off the graphing calculator, the TI-84Plus will return exactly as you left it, including the display, cursor, and any error.

If the TI-84Plus is turned off and connected to another graphing calculator or personal computer, any communication activity will “wake up” theTI-84Plus.

To prolong the life of the batteries, APD turns off the TI-84Plus automatically after about five minutes without any activity.

Turning Off the Graphing Calculator

To turn off the TI-84Plus manually, pressyM.

All settings and memory contents are retained by Constant Memory™.

Any error condition is cleared.


The TI-84Plus uses five batteries: four AAA alkaline batteries and one SR44SW or 303 silver oxide backup battery. The silver oxide battery provides auxiliary power to retain memory while you replace the AAA batteries. To replace batteries without losing any information stored in memory, follow the steps in Appendix C.

Chapter 1: Operating the TI-84Plus Silver Edition


Setting the Display Contrast

Adjusting the Display Contrast

You can adjust the display contrast to suit your viewing angle and lighting conditions. As you change the contrast setting, a number from 0 (lightest) to 9 (darkest) in the top-rightcorner indicates the current level. You may not be able to see the number if contrast is too light or too dark.

Note: TheTI-84Plus has 40 contrast settings, so each number 0 through 9 represents four settings.

The TI-84Plus retains the contrast setting in memory when it is turned off.

To adjust the contrast, follow these steps.

1.Press and release the ykey.

2.Press and hold or}, which are below and above the contrast symbol (blue, halfshaded circle).

lightens the screen.

}darkens the screen.

Note: If you adjust the contrast setting to 0, the display may become completely blank. To restore the screen, press and releasey, and then press and hold} until the display reappears.

Chapter 1: Operating the TI-84Plus Silver Edition


When to Replace Batteries

When the batteries are low, a low-batterymessage is displayed when you turn on the graphing calculator.

To replace the batteries without losing any information in memory, follow the steps in Appendix C.

Generally, the graphing calculator will continue to operate for one or two weeks after the low-batterymessage is first displayed. After this period, theTI-84Plus will turn off automatically and the unit will not operate. Batteries must be replaced. All memory should be retained.

Note: The operating period following the firstlow-batterymessage could be longer than two weeks if you use the graphing calculator infrequently.

The Display

Types of Displays

The TI-84Plus displays both text and graphs. Chapter 3 describes graphs. Chapter 9 describes how theTI-84Plus can display a horizontally or vertically split screen to show graphs and text simultaneously.

Home Screen

The home screen is the primary screen of the TI-84Plus. On this screen, enter instructions to execute and expressions to evaluate. The answers are displayed on the same screen.

Chapter 1: Operating the TI-84Plus Silver Edition