Question

Which of the following is a polynomial with roots –2, –3i, and 3i ?

x3 + 4x2 + 9x + 24

x3 – 4x2 + 9x – 24

x3 + 2x2 + 9x + 18

x3 – 2x2 + 9x – 18

Answer 1

f(x)=(x-(-2)) *(x-3i) *(x+3i)
= (x+2)(x^2+9)


so you can go on

Answer 2

x3+2x2+9x+18

Answer 3

x3 + 2x2 + 9x + 18 =
x^2 (x+2) +9(x+2)
is another way