## southrebels2 Group Title Which of the following is a polynomial with roots -3, -3i, and 3i ? A. x^3 + 3x^2 + 9x + 27 B. x^3 - 3x^2 + 9x - 27 C. x^3 + 9x^2 + 9x + 81 D. x^3 - 9x^2 + 9x - 81 one year ago one year ago

1. across

Expand the following:$(x+3)(x+3i)(x-3i).$

2. southrebels2

Well how do you expand with the i?

3. across

Remember that $$i=\sqrt{-1}$$. So, $$i\cdot i=-1$$, etc.

4. southrebels2