PLEASE HELPPPPPP

What are the possible numbers of positive, negative, and complex zeros of f(x) = x4 + 3x3 − 2x2 + 1? (6 points)

Positive: 2 or 0; negative: 2 or 0; complex: 4, 2, or 0

Positive: 2, or 0; negative: 4, 2 or 0; complex: 4, 2, or 0

Positive: 2 or 0; negative: 2 or 0; complex: 4, 2, or 0

Positive: 2 or 0; negative: 0; complex: 2, or 0

1 answer

real: 4,2,0
Using Descartes' Rule of Signs,
positive: 2 max
negative: 2 max
complex: 4,2,0

how come (a),(b),(c) are all the same?
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