Your homework for tonight is:
- Finish the solving by factoring problems on the Moodle (if necessary).
- Organize your notebook (and yourself) for the stretch run.
Here's that video of Arthur Benjamin doing math in his head. He's using (a + b)2 = a2 + 2ab + b2 and (a - b)2 = a2 - 2ab + b2 to help him (but it's still amazing that he can keep track of all the parts in his head).