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Do you know the Descrates rule of signs

no not really

How many sign changes are there in this polynomial
P(x) = 2x^5 − 3x^4 − 5x^2 − 2

there is one sign change

P(x) = +2x^5 − 3x^4 − 5x^2 − 2
I see one sign change.

You there?