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OpenStudy (anonymous):
(1+3i)(1-3i)
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OpenStudy (anonymous):
(1+3i)(1-3i) You can use foil to solve this.... But since they are conjugates of each other then you you'll just get.... 10
OpenStudy (anonymous):
The middle terms will cancel out when you foil.
OpenStudy (anonymous):
thanks again (:
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