Quadratic Formula Derivation

My Geometry Honors students have been cutting and gluing so much lately.  I think I’m going through a crafty phase in my teaching.  :)  I thought my Algebra 2 Honors kids might like to get in on the craftiness.  

I love using this activity to help students see the proof of the quadratic formula.  I use it as part of the lesson and have students add it to their foldable notes.

I typically derive the quadratic formula by hand for my students on the board while they follow along.  This year, I typed up each step in the proof and had my students derive it themselves.  It worked so well and they enjoyed doing it.  You can download the file that I used.

Quadratic Formula Derivation - activity file download

Quadratic Formula Derivation - activity file download

When we were finished, I showed them a couple of videos to help them memorize the quadratic formula.

This was my student's favorite.

Overall, it was a fun day in Algebra 2 Honors.


  1. Great idea! I was dreading the thought of standing in front of the class deriving the quad formula...again. This activity should go over much better! using this tomorrow - THANK YOU!

  2. I hope it worked out well for you Kristin!

  3. jamiebloodworth@walkerschools.orgDecember 14, 2017 at 11:30 AM

    There are a couple of versions to "Rolling in the Deep" that we like! (It fits the chorus perfectly)



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