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In this lesson, you will learn about Descartes' Rule of Signs and how to use it to predict the nature of roots of polynomials in algebra.
Descartes' rule of signs allows us to determine how many positive and negative roots a polynomial has. In order to do this, we must determine the number of variations in sign of the polynomial. We look at the terms, determine how many variations of sign there are, and from this determine how many positive and negative roots of the polynomial exist.