Descartes's Rule of Signs: Definition & Example

Instructions:

question 1 of 3

How many positive real roots do we expect from the polynomial x^3 -2x^2 - 5x + 6?

Create Your Account To Take This Quiz

As a member, you'll also get unlimited access to over 79,000 lessons in math, English, science, history, and more. Plus, get practice tests, quizzes, and personalized coaching to help you succeed.

Try it risk-free for 30 days. Cancel anytime

2. How many positive real roots do we expect from the polynomial x^3 + 2x^2 - x - 2?

Create your account to access this entire worksheet
Quizzes, practice exams & worksheets
Certificate of Completion
Create an account to get started

You can make sure you understand Descartes's rule of signs and its usage if you work on this printable worksheet and interactive quiz. Practice questions will ask you to find the number of negative and positive real roots in polynomial equations and to explain pieces of the rule.

Quiz & Worksheet Goals

• Expectation of positive real roots
• Expectation of negative real roots
• The use of 'multiples of 2' in Descartes's rule of signs

Skills Practiced

These guides will exercise the following skills:

• Problem solving - use acquired knowledge to solve for the number of expected real roots in practice problems
• Information recall - access the knowledge you've gained regarding the reasons behind elements of Descartes's rule of signs
• Reading comprehension - ensure that you draw the most important information from the related lesson on this math topic