What if you could solve any quadratic function without any guess-and-check or memorization? This method was actually known by the Babylonians nearly 2,000-3,000 years ago but it's hardly taught in schools. Po-Shen Loh shares how to use the technique, the moment he discovered it, and why it's still such a secret.

Po-Shen Loh is a social entrepreneur, working in the fields of mathematics, education, and healthcare. He founded expii.com, a free personalized learning platform that gives the middle school math curriculum a focus on creative thinking. He has created YouTube videos totaling over 10 million views. Po-Shen earned his Bachelors of Science (B.S.) in Mathematics from Caltech, his Master of Advanced Study (MASt) in Mathematics from the University of Cambridge, and his Ph.D. in Mathematics from Princeton before becoming a math professor at Carnegie Mellon University. He is also the national coach of the USA International Mathematical Olympiad team. In 2019, he received the prestigious United States Presidential Early Career Award for Scientists and Engineers.

This lesson is excerpted from Outlier’s Precalculus course. Learn more about this course and check out our full catalog at https://www.outlier.org.

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