Use Descartes Rule of signs to determine the number of positive and negative

👉 Learn about Descartes' Rule of Signs. Descartes' rule of the sign is used to determine the number of positive and negative real zeros of a polynomial function. Knowing the number of positive and negative real zeros enables also to also know the number of complex zeros of a complex number.

Descartes' rule of signs states that the number of positive real zeroes in a polynomial function f(x) is the same or less than by an even number as the number of changes in the sign of the coefficients of the terms of the polynomial function. The number of negative real zeroes of the f(x) is the same as the number of changes in sign of the coefficients of the terms of f(-x) or less than this by an even number.

Organized Videos:
✅Rational Zero Test and Descartes Rule of Signs
✅How to Use the Rational Zero Test
✅How to Use Descartes Rules of Signs

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[brianmclogan]

your welcome, a lot of my students have a hard time grasping this rule. So I am glad to here that my explanation worked for you!

[brianmclogan]

thank you so much, silly me, just added an annotation to not confuse others

[kiugieng]

How to use Descartes's rule of signs to write the possible numbers of non real complex