ACT Math: How to Use Zoom Fit + Minimum on the TI-84 to Find Vertex

Don’t know the vertex form of a parabola? No worries — your TI-84 can find the vertex for you in seconds.

In this video, I’ll show you exactly how to graph a quadratic on the TI-84, fix the viewing window using Zoom Fit, and calculate the minimum to identify the vertex instantly. This trick is perfect for ACT and SAT math problems involving parabolas, quadratics, and graph interpretation—especially when the graph appears “off-screen.”

It’s a major time-saver AND helps you avoid window-setting mistakes that confuse so many students.

📥 Download the FREE TI-84 ACT/SAT Calculator Starter Pack
Programs + shortcuts for faster problem-solving
👉 https://my2tor.com/ti84

🧠 About My2tor
I’m Tina Wiles, test-anxiety expert and founder of My2tor & ACTSATPrepHQ.com.
I teach students to master mindset, content, and strategy so they can walk into the ACT/SAT with confidence.

Subscribe for more TI-84 tutorials, ACT/SAT hacks, and test-taking strategies!

⏱ Timestamps
00:00 Intro
00:10 Understanding the problem
00:18 Entering the quadratic into Y=
00:42 Why the graph looks “wrong”
00:52 Using Zoom Fit
01:08 Using Zoom Out
01:35 Using 2nd → Trace → Minimum
01:42 Finding the vertex
01:57 Resetting your window (Zoom Standard)
02:14 Final tips + free starter pack

📺 Watch Next: TI-84 ACT/SAT Hacks Playlist
👉    • TI-84 Calculator Programs (ACT/SAT Calcula...