Po shen loh free#
Through Expii, Po-Shen extends his activity to the global mainstream, combining algorithms and crowdsourcing to deliver a free artificial intelligence powered tutor for the world of math and science. As an educator, he led Carnegie Mellon University’s math team to its first-ever #1 rank among all North American universities, and led the USA Math Olympiad team to its first-ever back-to-back #1-rank victories in 20. His scientific research considers a variety of questions that lie at the intersection of combinatorics (the study of discrete systems), probability theory, and computer science. He is the national coach of the USA International Mathematical Olympiad team, a math professor at Carnegie Mellon University, and the founder of the social enterprise, an education technology startup providing a free personalized learning platform on every smartphone.Īs an academic, Po-Shen has numerous distinctions, from an International Mathematical Olympiad silver medal to the National Science Foundation’s CAREER award. But the internet was still in its infancy, and the idea faded away.Po-Shen Loh is a math enthusiast and evangelist. He continued using that approach, as did some other teachers he knew. But it seemed to be an improvement over the usual way of teaching the subject. “I honestly can’t remember exactly where the eureka moment was,” Mr.
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Loh filled in some nuances of logic in explaining why it works. Savage in the journal The Mathematics Teacher in 1989 laid out almost the same procedure, although Dr. He even found out that a math teacher in Sudbury, Canada, named John Savage came up with a similar approach 30 years ago. It was only later that people came up with the concepts of negative numbers, zero and even more esoteric concepts like imaginary numbers - the square roots of negative numbers. Loh delved into mathematics history to find that the Babylonians and Greeks had the same insights, although their understanding was limited because their math was limited to positive numbers. Loh’s version is easier for students because it, “provides one method for solving all kinds of quadratic equations.” A technique with ancient rootsĭr.
Po shen loh how to#
“Math is not about memorizing formulas without meaning, but rather about learning how to reason logically through precise statements,” Dr. (It also provides a more straightforward proof.) Loh’s method allows people to calculate the answers without remembering the exact formula. This alternate method for solving quadratic equations uses the fact that parabolas are symmetrical.ĭr.
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“If you graph it, it’s much easier for the kids to understand what’s going on,” he said. But for many algebra students, the jumble of algebraic symbols is still confusing. Loh’s method eliminates this guessing game. Guessing also becomes cumbersome for quadratics with large numbers, and it only works neatly for problems that are contrived to have integer answers.ĭr. “The fact that you suddenly have to switch into a guessing mode makes you feel like maybe math is confusing or not systematic,” Dr.
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Po shen loh trial#
If they exist, then r and s are the two and only two solutions.įiguring out the factors that work is essentially trial and error. The key is to find r and s such that the sum of r and s equals 4 (that is, r + s = 4), and multiplying r and s produces –5 ( r × s = –5). Multiplying out ( x – r)( x – s) produces x² – ( r + s) x + rs.