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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'.
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