Question

What are the possible number of positive, negative, and complex zeros of f(x) = –x6 + x5– x4 + 4x3 – 12x2 + 12 ?

Answer 1

every polynomial function of degree \[n \ge1\] has exactly n complex zeros, not necessarily distinct.

Answer 2

how about this?

Answer 3

f(x) is a polynomial of degree 6 so it has 6 of + or - or complex zeros