# Descartes' rule of signs

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### Introduction

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### Examples

#### Lessons

**Use Descartes' Rule of Signs to Determine the Number of Positive and Negative Roots**

Use Descartes' Rule of Signs to determine the possible number of positive roots and negative roots:**Use the Rational Roots Theorem, together with Descartes' Rule of Signs, to Find Roots Effectively**

Solve: