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Which expression is equal to  −2i(−9+6i) ?

 Dec 20, 2017
 #1
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Which expression is equal to  −2i(−9+6i) ?

 

\(\begin{array}{|rcll|} \hline && -2i(-9+6i) \\ &=& 18i-12i^2 \quad & | \quad i^2 = -1 \\ &=& 18i-12(-1) \\ &=& 18i+12 \\ &=& 12 + 18i \\ \hline \end{array}\)

 

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 Dec 20, 2017

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