# How to Put Infinity in TI-84 | The Ultimate Guide

## Introduction:

The TI-84 graphing calculator is a powerful tool for students, professionals, and mathematicians alike. It can handle complex calculations and graphing functions, making it an essential device for many individuals. However, finding the infinity symbol (∞) on the TI-84 calculator can sometimes be a challenge. In this article, we will guide you step-by-step on how to input the infinity symbol in your TI-84 calculator.

## Step 1: Accessing the Catalog

To input the infinity symbol on your TI-84 calculator, you need to use the Catalog feature. Press the “2nd” button, located at the top left corner of the calculator, followed by the “0” key. This combination will bring you to the Catalog menu.

## Step 2: Searching for the Infinity Symbol

Once you are in the Catalog menu, press the letter “I” to jump to the commands starting with “I.” Scroll down the list using the arrow keys until you find “infinity.” Select it by pressing the “Enter” key.

## Step 3: Entering the Infinity Symbol

After selecting the “infinity” command, the calculator will automatically insert the infinity symbol (∞) at the current cursor position. If you need to place it elsewhere within an expression, use the arrow keys to navigate to the desired location, and then press “Enter” to insert the symbol.

## Step 4: Utilizing the Inequality Symbols

In addition to the infinity symbol, you might also need to use inequality symbols like “≤” (less than or equal to) and “≥” (greater than or equal to) in your calculations. To access these symbols, follow the same process as Step 1, but press “L” when you reach the Catalog menu. Scroll down to find “less than or equal to” or “greater than or equal to,” and insert them using the same method mentioned in Step 3.

## Step 5: Saving Infinity as a Variable

If you frequently use the infinity symbol (∞) in your calculations, you may want to save it as a variable. This will allow you to access it quickly whenever needed without having to navigate through the Catalog menu repeatedly. To save infinity as a variable, follow these steps:

- Press the “2nd” button, followed by the “alpha” key located on the bottom left of your calculator.
- After pressing “alpha,” locate the “STO->” key, which is situated just above the “on” button.
- Now, scroll down the variable list using the arrow keys to choose an available variable to store the infinity symbol. Press “Enter” once you have selected the desired variable.
- Finally, enter the infinity symbol (∞) from the Catalog menu using the process described in Step 2 and Step 3, and press “Enter” to save it as the value of the chosen variable.

## Conclusion

By following these simple steps, you can effortlessly insert the infinity symbol (∞) on your TI-84 calculator. Whether you need it for mathematical calculations, graphing functions, or working with inequalities, having access to this symbol can enhance your problem-solving abilities. Moreover, by saving it as a variable, you can conveniently access infinity whenever needed without going through the Catalog menu repeatedly. Make the most out of your TI-84 calculator and embrace the power of infinity symbol with ease!