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Math Help - Calculate this number

  1. #1
    Super Member dhiab's Avatar
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    Calculate this number

    Calculate :
     <br />
\sqrt[3]{2+11i}+\sqrt[3]{2-11i}<br />
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  2. #2
    Senior Member Stroodle's Avatar
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    I guess one method would be:

    z^3=2+11i

    (a+bi)^3=2+11i

    a^3-3ab^2+(3a^2 b-b^3)i=2+11i

    Then you would have two equations to solve for the first term in the problem:  a^3-3ab^2=2 and 3a^2 b-b^3=11
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  3. #3
    Super Member dhiab's Avatar
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    Hello I'have a simply solution
    Look here :
    Attached Thumbnails Attached Thumbnails Calculate this number-28.jpg  
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