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The number of positive roots (or zeros) is less than or equal to the number of sign changes for the terms of a polynomial, f(x).
Also, the number of negative roots (or zeros) is less than or equal to the number of sign changes for the terms of a polynomial, f(-x).
In each case, if the number of roots is less than the number of sign changes, then it differs by a multiple of 2 is what?
What is Descartes' Rule of Signs