# Quadratic Formula Program TI84 Calculator

Below you can see it in action:

## Quadratic Formula Program TI 84 Calculator

In the first example, we have a typical quadratic equation:

So, in the form of Ax^2 + Bx + C = 0, A would be 1, B would be 5 and C would be 6. Basically, the A, B, and C are the coefficients of the terms of your expression, in descending powers of x.

Once you enter these, the calculator will give you this output:

Below that, it shows how it would show up as the second-to-last step of a quadratic equation done by hand. Basically, the answer is (-5 +/-1)/2. Read aloud, it would be

Negative 5 plus or minus 1, divided by 2.

That’s how the answers are negative 2 and negative 3.

## A Quadratic Equation With Imaginary (Complex) Solutions

Sometimes you will encounter quadratic equations with imaginary solutions. That’s because the discriminant is negative. Any time the discriminant is negative, or below zero, your solutions will be imaginary numbers. As such, you’ll see i in the answers.

The QUAD program will momentarily change a mode on your TI 84 calculator. It will change from whatever setting you have to a +bi answers.

Not to worry: the QUAD program will restore whatever setting you had before using the program. However, I’d recommend you change your mode to a + bi. In case you encounter a negative in the radical, your calculator will furnish you with a complex answer. That’s helpful in most math classes from algebra 1 onwards.

Here is a video showing you how to do this:

So, as long as you have a TI 84 calculator, a mini-USB to USB cable to help your calculator communicate with your computer, a computer, you should be fine. You’ll just need to download TI Connect so that your devices can communicate.