Find number of positive and negative real zeros by descartes


1. Solve system by substitution method. x+y=6

2. Utilize synthetic division to divide f(x)=x^3+15x^2+71x+105 by x+7. Utilize result to determine all zeroes of "f"

3. Use Descartes rule of signs to find possible number of positive and negative real zeros for given function. f(x)=6x8-9x7+x6-3x+18

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Mathematics: Find number of positive and negative real zeros by descartes
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