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Use Descartes's rule of signs to state the number of possible positive and negative real roots. (Enter your answers as a comma-separated list.) x 4

Use Descartes's rule of signs to state the number of possible positive and negative real roots. (Enter your answers as a comma-separated list.)x⁴+2x³20x²2x+21= 0

number of possible positive real roots

number of possible negative real roots

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