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OpenStudy (anonymous):
What are the possible number of positive, negative, and complex zeros of f(x) = 3x4 - 5x3 - x2 - 8x + 4
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OpenStudy (anonymous):
answers: Positive: 2 or 0; Negative: 2 or 0; Complex: 4 or 2 or 0 Positive: 2 or 0; Negative: 2 or 0; Complex: 4 or 2 Positive: 3 or 1; Negative: 1; Complex: 2 or 0 Positive: 4 or 2 or 0; Negative: 2 or 0; Complex: 4 or 2 or 0
OpenStudy (anonymous):
a very readable and reasonable explanation is here http://www.purplemath.com/modules/drofsign.htm
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