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## anonymous 4 years ago 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

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1. across

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

2. anonymous

Well how do you expand with the i?

3. across

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

4. anonymous

Im totally confused..can you just tell me the answer please.

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