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TeachMeFinance.com - explain Descartes Rule of Signs Descartes Rule of Signs The term 'Descartes Rule of Signs' as it applies to the area of basic math can be defined as 'a mathematical method for the determination of both positive and negative zeros of a function; let P(x) be a polynomial with real coefficients: the number of positive zeros of P is either equal to the number of variationsin sign of P(x) or less than this by an even number, and the number of negative real zeros of P is either equal to the number of variations in sign of P(-x) or less than this by an even number'. Previous 5 Terms: dermatology Derrick DES desalination Desalinization Next 5 Terms: descending descending node Descriptive epidemiology Descriptor desert About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.