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OpenStudy (anonymous):
Does -9i(8i-7)=63i-72i^2?
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OpenStudy (anonymous):
basically yes but as i^2 = -1 that is 72-63i
OpenStudy (anonymous):
the only choices I have are -72+63i or 72+63i or 63i+72i^2 or 63i-72i^2
OpenStudy (anonymous):
yes you are right
OpenStudy (anonymous):
thanks for your help!
OpenStudy (anonymous):
np
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