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Math Help - Complex Roots to Cubic Equation

  1. #1
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    Complex Roots to Cubic Equation

    Hi,

    Can someone tell me how to convert:

    (x + 5.4 - 7.2i)(x + 5.4 + 7.2i)(s + 5)

    to Cubic form please
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  2. #2
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    Re: Complex Roots to Cubic Equation

    Should that last bracket have x + 5 in it instead of s + 5? If not, you don't have a cubic...
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  3. #3
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    Re: Complex Roots to Cubic Equation

    yeah sorry, its x + 5
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  4. #4
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    Re: Complex Roots to Cubic Equation

    Do you know how to distribute from one polynomial to another? i.e. multiply them?
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