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Descartes' Rule of signs Use Descartes' Rule positive and how of Signs to determine how many...

Descartes' Rule of signs Use Descartes' Rule positive and how of Signs to determine how many negative real zeros of the polynomial can have. Then determine the possible total number of real zeros.

P(x) = x^3 - x^2 - x - 3

P(x) = 2x^3 - x^2 + 4x -7

P(x) = 2x^6 + 5x^4 - x^3 -5x -1

P(x) = x^4 + x^3 + x^2 + x + 12

P(x) = x^5 + 4x^3 - x^2 + 6x

P(x) = x^8 - x^5 + x^4 - x^3 + x^2 - x + 1

*** Please explain to me very detaily***

Thank you very much.

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