Which of the following is the complete list of roots for the polynomial function f(x) = (x^2+6x+8)(x^2+6x+13)? –3 + 2i, –3 – 2i –2, –4 –2, –4, –3 + 2i, –3 – 2i –2, –4, –3 + 2i, 3 + 2i