Question

What are the possible number of positive, negative, and complex zeros of f(x) = –x^6 + x^5– x^4 + 4x^3 – 12x^2 + 12 ?
answers:
A)Positive: 3 or 1; Negative: 3 or 1; Complex: 4, 2, or 0

B)Positive: 5, 3, or 1; Negative: 1; Complex: 4, 2, or 0

C)Positive: 2 or 0; Negative: 2 or 0; Complex: 6, 4, or 2