TI-84 Quadratic Formula Program (ACT/SAT Calculator Hack!)

Learn how to program your TI-84 calculator to solve any quadratic equation using the quadratic formula!
This tutorial shows you step-by-step how to write a TI-84 program that:

Prompts for a, b, and c
Calculates the discriminant
Checks for no real solutions
Computes both solutions using the full quadratic formula
Displays x₁ and x₂ instantly

This is one of the most useful TI-84 programs for ACT and SAT math students — a huge time-saver on algebra and polynomial problems.

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👉 https://my2tor.com/ti84

🧠 About My2tor
I’m Tina Wiles, test anxiety expert and founder of My2tor & ACTSATPrepHQ.com.
I help students master the mindset, strategy, and content they need to succeed on high-stakes exams like the ACT and SAT.

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⏱ Timestamps
00:00 Intro
00:19 Creating new program (QUAD)
00:34 Displaying standard form
01:00 Prompt for A, B, C
02:08 Computing the discriminant (B² - 4AC)
02:23 Storing discriminant
02:37 Writing IF statement
02:50 Display “No real answers”
03:33 Calculating quadratic formula
04:00 Square root of discriminant
04:11 Dividing by 2A
04:32 Calculating second solution
04:48 Storing solutions
05:10 Displaying x₁ and x₂
05:36 Testing with example (x² - x - 6)
06:01 Testing no real solutions case
06:45 Outro

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