Polynomial with real coefficients

I have a problem that I am not understanding for homework:

Quote:

Find a polynomial with real coefficients, degree of 3, zeros of 2,1,-i, and satisfies the condition that f(0)=4

I assumed that thus the constant would be '4'... (ax^3 + ax^2 +ax +**4**)

And I assumed that the zeros would meand: **(x-2)(x-1)** and **(x^2+1)**

The problem that I am facing is that the above would result in a degree of 4, not 3. Is there some small bit I am missing, or am I misinterperting (sp?) the question.