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OpenStudy (anonymous):
(7+2i) · (7-2i)
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OpenStudy (anonymous):
the answer is 53. but i'm not sure how they got that answer
OpenStudy (anonymous):
solve as a normal equation with two factors |dw:1331310195628:dw| Since i^2=-1
OpenStudy (anonymous):
|dw:1331310292950:dw|
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