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southrebels2

  • 3 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
    • 3 years ago
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    Expand the following:\[(x+3)(x+3i)(x-3i).\]

  2. southrebels2
    • 3 years ago
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    Well how do you expand with the i?

  3. across
    • 3 years ago
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    Remember that \(i=\sqrt{-1}\). So, \(i\cdot i=-1\), etc.

  4. southrebels2
    • 3 years ago
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    Im totally confused..can you just tell me the answer please.

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