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### TI-84 Plus Keyboard Basics

The row of keys under the TI-84 Plus calculator screen contains the keys you use when graphing. The next three rows, for the most part, contain editing keys, menu keys, and arrow keys. The arrow keys [more…]

### Edit Entries on the TI-84 Plus Calculator

When using the TI-84 Plus calculator, especially when you first start using it, you are going to make errors or press the wrong keys. The TI-84 Plus calculator offers four ways to edit an entry: [more…]

### TI-84 Plus Graphing Calculator Menus

Most functions and commands that you use on the TI-84 Plus are found in the menus housed in the calculator. Following is an overview of how to find and select menu items. [more…]

### Set the Mode on Your TI-84 Plus Calculator

The Mode menu, which is accessed by pressing [MODE], is the most important menu on the TI-84 Plus calculator; it tells the calculator how you want numbers and graphs to be displayed. The Mode menu for [more…]

### The TI-84 Plus Calculator Catalog

The TI-84 Plus calculator’s Catalog houses every command and function used by the calculator. However, it’s usually easier to use the keyboard and the menus to access these commands and functions than [more…]

### Evaluate Arithmetic Expressions with the TI-84 Plus Calculator

Arithmetic expressions are evaluated on the TI-84 Plus Home screen. The Home screen is the screen you see when you turn the calculator on. If the Home screen is not already displayed on the calculator, [more…]

### TI-84 Plus Calculator Keys to Access Functions

Starting with the fifth row of the TI-84 Plus calculator, you find the functions commonly used on a scientific calculator. Here’s what they are and how you use them: [more…]

### Order of Operations and the TI-84 Plus Calculator

The order in which the TI-84 Plus calculator performs operations is the standard order that you are used to. Spelled out in detail, here is the order in which the calculator performs operations: [more…]

### Recycle Previous Answers and Entries with the TI-84 Plus Calculator

You can use the previous answer in the next arithmetic expression you want to evaluate on your TI-84 Plus calculator. If that answer is to appear at the beginning of the arithmetic expression, first key [more…]

### Store Variables with the TI-84 Plus Calculator

The letters STO may look like texting language, but the TI-84 Plus calculator's STO key is a handy feature to have around. If you plan to use the same number many times when evaluating arithmetic expressions [more…]

### How to Work in Scientific Notation on the TI-84 Plus Calculator

Scientific notation on a TI-84 Plus calculator looks a little different than what you’re used to seeing in class. For example, 2.53*10^{12} will display as 2.53 [more…]

### Exponents and Roots on the TI-84 Plus Calculator

In MathPrint mode on your TI-84 Plus calculator, exponents actually look like exponents! There are two ways to square a number. One way is to type a number and press [more…]

### TI-84 Plus Calculator's Equation Solver

The Equation Solver on your TI-84 Plus calculator is a great tool for solving one-variable equations. The Solver is also capable of solving an equation for one variable given the values of the other variables [more…]

### How to Assign Values to Variables on Your TI-84 Plus Calculator

Did you know that your TI-84 Plus calculator can solve equations that have more than one variable? The trick is that you must assign values to all the variables except the one that you’re solving for. [more…]

### Find Multiple Solutions with the TI-84 Plus

Some equations can have more than one solution. You can easily find multiple solutions on your TI-84 Plus. If you’re dealing with an absolute value equation or an equation with a degree larger than one [more…]

### Define Solution Bounds in TI-84's Equation Solver

When the equation you’re solving on your TI-84 Plus calculator has multiple solutions, it’s sometimes helpful to redefine the **bound** variable. Trigonometric functions are notorious for having infinite number [more…]

### How to Use the TI-84 Plus Calculator's Solve Function

There are multiple ways to use the TI-84 Plus calculator to solve equations. The Solve function is difficult to locate, but relatively painless to use. Unfortunately, the Solve function can only be found [more…]

### The PlySmlt2 App on Your TI-84 Plus Calculator

Using the Equation Solver or the Solve function on your TI-84 Plus calculator works pretty well for linear or quadratic equations. But how can you use your calculator to solve polynomial equations with [more…]

### Accessing Catalog Help from the TI-84 Plus Calculator's Math Menu

Many of the Math menu functions on the TI-84 Plus calculator have a hidden Help feature available at the press of a single key! To access the Catalog Help from the Math menu, follow these steps: [more…]

### TI-84 Plus Calculator's Math MATH Submenu

Press [MATH] to access the Math MATH submenu on your TI-84 Plus calculator. This submenu contains general mathematical functions you can insert into an expression. [more…]

### TI-84 Plus Calculator's Math NUM Submenu

On the TI-84 Plus calculator, several important items are housed in the Math NUM submenu. To access the Math NUM submenu, you press the following keys: [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…]