Question

What are the possible number of positive, negative, and complex zeros of f(x) = -3x4 - 5x3 - x2 - 8x + 4 ?

Answer 1

Positive: 2 or 0; Negative: 2 or 0; Complex: 4 or 2 or 0
Positive: 1; Negative: 3 or 1; Complex: 2 or 0
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

Answer 2

b

Answer 3

thank you

Answer 4

http://www.purplemath.com/modules/drofsign.htm

Answer 5

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Answer 6

A plot and solution is attached.