Ideas that were cool in this unit

In this unit I thought that it was cool to be able to use long division to factor.  I remeber the frustration in elementary school and thinking when am I ever going to use this beyond this unit?  For this concept to come back was neat.  Factoring did not seem to give me a lot of trouble and I felt that this unit ran fairly smoothly.  Factoring by grouping was a new idea to me but once I had practiced it a few times, it made sense.  I liked how finding the domain came back from the first unit and applied again.  This made for good revview and preparation asthe exam draws nearer.