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OpenStudy (anonymous):
Which expression is equivalent to 21 + square root(-36) 27i 21 + 6i 21 - 6i 21i and can you tell me how to do it?
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OpenStudy (saifoo.khan):
B i guess
OpenStudy (saifoo.khan):
yes it's B
OpenStudy (anonymous):
howd you do it
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