Quadratic Method: Detailed Explanation

Po-Shen Loh is a social entrepreneur, working across the full spectrum of mathematics and education, all around the world. He is the founder of the free personalized learning platform expii.com, a social enterprise supported by his series of online math courses that reinvent the middle school math curriculum with a focus on creative thinking. He is also a math professor at Carnegie Mellon University and the national coach of the USA International Mathematical Olympiad team.