How do i answer this maths question (complex numbers)?

  • Thread starter Thread starter Sky G
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Sky G

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z = 3+ 3i is a root to the following equation:

z³ -18z +108 = 0

I know 3 - 3i is but how do I get the other root? I know what the answer is from past paper answers but I won't tell you in case anyone bluffs, but how do i find the remaining root?
 
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