# How to Use a TI 84 Calculator

by Nicholas Smith

The TI 84 is an advanced graphic calculator. You can view equations and their graphs, along with coordinates on the device. The device contains a process which helps to quickly present results to you. The device also has the ability to connect to your computer for expanded capability. Available capabilities include advanced statistics, regression analysis, graphical and data analysis, among others.

### Basic Functions

Power on the TI84 by pressing "ON," and power off the device by pressing "2nd," and "Off."

Adjust the screen's contrast by pressing "2nd" and "Up" or "Down."

Press the "Up" or "Down" buttons to display your previous instructions to display previously entered instructions or expressions evaluated by the device.

Configure the clock by pressing, "Mode," "Down" and browsing to "Set Clock." Press "Enter" and set the clock to desired settings.

### Entering Expressions on the TI-84

Enter a single desired expression on the TI 84 keypad and press "Enter."

Enter two or more expressions on one line, separated by a colon. Access the colon by pressing "Alpha" and ":".

Enter a number in scientific notation. First, enter the portion of the number that precedes the exponent. Then, press "2nd," and "EE." Enter the exponent or one or two digits.

### Set the TI 84 Mode (Controls Display of Numbers and Graphs)

Press "Mode" on the device's keypad.

Review the list of available modes. For example, the "Normal" setting displays results in "Numeric notation," while "Float" displays the number of decimal places in your answers.

Press the arrow keys to select a mode, and press "Enter."

### Enter Complex Numbers

Select a complex number mode. Press "Mode," and choose "Rectangular-complex Mode," or "Polar-complex Mode."

Enter a complex number as a "real number," or an "expression" that evaluates real numbers. Fractions are allowed in complex numbers.

View the complex results on the device's home screen. Results are displayed in the device's "MathPrint" format, or the "Classic" format.