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### How to Use the TI-84 Plus Backup and Restore Tools

If you have TI-84 Plus calculator files that would be hard to replace, you need to learn how to use the Backup and Restore tools. If your rechargeable battery loses its charge, you are in real danger of [more…]

### 10 Common Errors when Using the TI-84 Plus

Even the best calculating machine is only as good as its input. This list identifies ten common errors made when using the TI-84 Plus calculator. Wouldn’t it be great to avoid some of the common errors [more…]

### 10 Common TI-84 Plus Error Messages

Following is a list of ten common error messages the TI-84 Plus calculator may give you. When you get an error, pay close attention to the error message screen. Your calculator displays a descriptive note [more…]

### Create and Save Calculator Programs on the TI-84 Plus

The programming language used by the TI-84 Plus calculator is similar to the Basic programming language. It uses the standard commands (such as the “If …, then …, else …” command) that are familiar to [more…]

### Input Commands for the TI-84 Plus

The **Input** and **Prompt** commands on the TI-84 Plus calculator are used in a program to solicit information from the program user. The **Input** command asks the user for the value of only one variable and enables [more…]

### The Disp and Output Commands for TI-84 Plus Programs

The **Disp** and **Output** commands on the TI-84 Plus are used by a program to display text messages and values. The **Disp** command is capable of displaying more than one piece of information, and the [more…]

### Use a Program to Display a Graph on the TI-84 Plus

You can use a program to display graphs on your TI-84 Plus calculator. In the program in this example, the **PlotsOff**command turns off all stat plots and the [more…]

### How and When to Clear the TI-84 Plus Home Screen

Because programs display their output on the TI-84 Plus Home screen, it is a good idea to have your program clear the Home screen before the output is displayed. This is done by inserting the [more…]

### How to Use a Program to Write Text on the TI-84 Plus

The **Disp** and **Output** commands on the TI-84 Plus calculator are used to get a program to display text on the Home screen. Because each line of the Home screen can accommodate up to 26 characters, the wise [more…]

### Change the Color and Graph Style of a TI-84 Plus Function

With the TI-84 Plus C calculator, you can change the color as well as the graph style of functions on the TI-84 Plus. In this program, the **GraphStyle(***function* [more…]

### How to Change the Color of Text on a TI-84 Plus Graph

With the TI-84 Plus C calculator, you can change the color of the text displayed on graphs. In this program, the **TextColor(***color#*) command can be used to set the color of the text prior to using the Text [more…]

### 3 Decision Commands on the TI-84 Plus

The Ti-84 Plus calculator can handle three decision commands (**If**, **If . . . Then . . . End**, and **If . . . Then . . . Else . . . End**). Here is how to use these commands in a program. [more…]

### The While . . . End Command on the TI-84 Plus

The TI-84 Plus calculator can handle three looping commands. The structure of the **While . . . End** command appears in the first screen. If the condition following the [more…]

### The Repeat . . . End and For . . . End Commands on the TI-84

The TI-84 Plus calculator can handle three looping commands (**While . . . End**, **Repeat . . . End**, and **For . . . End**). The **While . . . End** and **Repeat . . . End** [more…]

### How to Graph Polar Equations on Your TI-84 Plus

After you have set the window and entered the polar equation, graphing the equations on your TI-84 Plus is easy. Before you press [GRAPH], make sure you watch the direction as your graph is created. If [more…]

### How to Enter and Store Matrices on the TI-84 Plus

You can enter and store matrices on your TI-84 Plus calculator. A *matrix* is a rectangular array of numbers arranged in rows and columns. The dimensions, r x c, of a matrix are defined by the number of [more…]

### Matrix Arithmetic on the TI-84 Plus Calculator

You can use your TI-84 Plus calculator to perform matrix arithmetic. When evaluating arithmetic expressions that involve matrices, you usually want to perform the following basic operations: scalar multiplication [more…]

### Evaluate the Determinant and Other Matrix Operations on the TI-84 Plus

Quite a few operations are unique to matrices. All the matrix-specific operations on the TI-84 Plus calculator are found by accessing the MATRX MATH Operations menu [more…]

### How to Solve a System of Equations on the TI-84 Plus

Matrices are the perfect tool for solving systems of equations (the larger the better). Fortunately, you can work with matrices on your TI-84 Plus. All you need to do is decide which method you want to [more…]

### How to Work with Fractions on the TI-84 Plus

There’s no fraction key on the TI-84 Plus calculator, per se, but many fraction tools are built into this calculator. For starters, isn’t a fraction just division in disguise? So, pressing / between two [more…]

### How to Work with Complex Numbers on the TI-84 Plus

Fortunately, your TI-84 Plus calculator knows how to handle complex numbers. Complex numbers are of the form *a* + *b*** i**, where

*a*is the real part and

*b*is the imaginary part. [more…]

### How to Use the CMPLX Menu on the TI-84 Plus

Your TI-84 Plus calculator has a CMPLX menu of functions designed to accomplish just about any task you need to when working with complex numbers.

The functions most often used with complex numbers are [more…]

### Convert Degrees to Radians with the TI-84 Plus Calculator

The functions housed in the Angle menu on your TI-84 Plus calculator enable you to convert between degrees and radians or convert between rectangular and polar coordinates. To convert degrees to radians [more…]

### Convert between Degrees and DMS with the TI-84 Plus Calculator

The functions available in the TI-84 Plus calculator's Angle menu enable you to convert between decimal degrees and DMS (degrees, minutes, and seconds). You can also override the angle setting in the Mode [more…]

### How to Use the Test Menu on the TI-84 Plus

The often overlooked Test menu on the TI-84 Plus enables you to use your calculator in creative ways to solve problems. Do you want to do better on your next standardized test? Some of these tips just [more…]