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OpenStudy (anonymous):
(1/3+3i)(1/3-3i)
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jimthompson5910 (jim_thompson5910):
hint: (a+bi)*(a-bi) = a^2 + b^2 this page shows why that formula is true http://www.regentsprep.org/Regents/math/algtrig/ATO6/multlesson.htm
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