Each year I hold a "Factoring Bootcamp" where I spend two days factoring all sorts of quadratic functions.
This is day 2, where a>1. Students have a mini-lesson (15 minutes) on how to factor with a>1 and then have class time to practice with partners. Partner 1's answers are Partner 2's questions and vice-versa. this way students can check each other's work.
This lesson includes notes, classwork, homework and an exit card.