This is the template I created this year after becoming obsessed with warm up templates. I always emphasize writing down a, b and c because of how it cuts down on errors. The structure of the formula also gives my students trouble, so the "skeleton" formula has been helpful, especially in the first days of learning the formula. Warm up templates have been a real game-changer in my classes. They give my students the repetition they need to be independent and also free up so much of my planning time. I just print a stack and go!
That slide above is part of the Powerpoint I shine on the smart board that goes along with the warm up template. Students transfer the equation onto their template and solve on their own.
You can get this Quadratic Formula template here. You can also check out this post for more free Algebra and Algebra 2 warm up templates.
If you're looking for a way to summarize your unit, this Quadratic Formula pennant is a fun way to assess student understanding of the Quadratic Formula while also decorating your classroom with math.