Determine the number of positive and negative real zeros of a polynomial

The video tutorial explains how to determine real zeros of polynomials, distinguishing between real and imaginary zeros. It covers the process of identifying positive real zeros by analyzing sign changes in monomials and applying Cart's rule. The tutorial also demonstrates how to find negative real zeros by substituting negative values into the polynomial function and observing sign changes.

What happens when you substitute negative X into the function, and how does it affect the signs?

Why can't you have negative real zeros, according to the text?