You can put this solution on YOUR website! For f(x)=3x^4+7x^3-x^2+5x-4, use synthetic division to determine f(-1/3).
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-1/3)....3....7....-1....5....-4
.........3....6....-3....6...|..-6
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f(-1/3) = -6
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Cheers,
Stan H.