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OpenStudy (anonymous):
(8-11i)(8-11i) help solve?
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OpenStudy (anonymous):
i*i=-1
OpenStudy (mathmate):
Expand and simplify it like (a+b)^2, and whenever you get i^2, substitute with -1 as decriptr37 suggested.
OpenStudy (anonymous):
it's because \[\sqrt{-1}=i\]
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