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college algebra--please help

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what does Descartes rule of signs tell you about the possible number of positive real number zeros and the possible number of negative real zeros of the function?

1. f(x)=2x^5-5x^2+x-1
2. f(x)=5x^6+7x^4-x-6

please show work

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    f(x) = 2x3 - 7x2 + 8x + 2

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