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

Find the maximum number of real zeros, and Use Descartes's rule of signs to determine how many positive and how many negative zeros the function has. You do not need to find the zeros.

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  1. find only rational zeros f(x)=x^5-9x64+21x^3+11x^2-100x=100

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