Question 1037022
For polynomial functions with real coefficients, imaginary zeros come in pairs, so a polynomial function with real coefficients can have 0,2,4, 6,...imaginary zeros.
However, a polynomial with degree 3 cannot have more than 3 zeros,
so these functions can have {{{highlight(0)}}} or {{{highlight(2)}}} imaginary zeros.
Polynomials of odd degree must have at least 1 real zero.
They could have 1, 3, 5, all the way up to their degree.
 
NOTE:
Each of those functions happens to have exactly 1 real zero.
Some calculus plus calculations (or a graphing calculator) would tell you that.
Since they are cubic (degree=3) polynomials, they must have a total of 3 zeros,
so the other {{{3-1=2}}} zeros are imaginary.
You are probably not expected to be able to reach that conclusion, though.