7:22

Art of Problem Solving: 2016 AMC 12 A #23

11:51

Art of Problem Solving: 2017 AMC 10 A #25

12:05

Art of Problem Solving: 2012 AMC 10 A #25

5:48

Art of Problem Solving: 2015 AMC 10 A #23 / AMC 12 A #18

9:46

Art of Problem Solving: 2015 AMC 10 A #25 / AMC 12 A #23

3:54

Simon's Favorite Factoring Trick

9:54

Art of Problem Solving: 2012 AMC 10 B #25 / AMC 12 B #22

4:35

Art of Problem Solving: 2018 AMC 10 A #24 / AMC 12 A #18