if i= square root of -1, then -4i (6i ) is...
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Let's review the properties of i: $\displaystyle i = sqrt (-1) $ $\displaystyle i^2 = -1 $ $\displaystyle i^3 = -i $ $\displaystyle i^4 = 1 $ each set of i iterates in this fashion which means $\displaystyle i^5 = sqrt(-1)$
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