Using descartes rule of signs to find the number of positive and negative real zeros

The video tutorial explains how to determine the number of positive and negative real zeros in a polynomial using the rational zero test and Descartes' Rule of Signs. It covers the process of identifying sign changes in the polynomial's terms to find possible real zeros. The tutorial also emphasizes the importance of evaluating the polynomial for negative values of X to determine negative real zeros.

How do you evaluate for negative X in a polynomial?

What happens to the sign of a negative number raised to an odd power?

Why can't there be a negative number of zeros in a polynomial?