Which rule, test, or theorem will you find the probable number of positive and negative real zeros of a polynomial function?

The number of positive and negative roots or zeros of a polynomial function is predicted through the Descartes Rule of Sign. This was first described by Rene Descartes in his work La Geometrie. The technique is for determining an upper bound on the number of positive and negative real roots. 

9.8? i'm not really sure