I love teaching quadratics. It's the unit where I see the most student growth and where students seem to be the most proud of what they learn to do. In our classes, we first learn to factor, then move to the Quadratic Formula and then to quadratic word problems. My students have all seen factoring in Algebra 1 and Geometry, so it's not totally new to them. Still, factoring can feel completely new to some students, so I always start from the very beginning.