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OpenStudy (anonymous):
9i(9-9i) is it 81i-81^2 ?
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OpenStudy (anonymous):
it is, but \(i^2=-1\) so you have \[81i+81\]
OpenStudy (anonymous):
in standard form as \(81+81i\)
OpenStudy (anonymous):
thank you that helps.
OpenStudy (anonymous):
yw
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