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OpenStudy (anonymous):
(9+5i)(2-4i)
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OpenStudy (anonymous):
\[(9*2)+(9*-4i)+(5*2i)+(5i*-4i)\] \[18-36i+10i-20i^2=18-26i+20=38-26i\]
jhonyy9 (jhonyy9):
18-36i+10i+20=38-26i
jhonyy9 (jhonyy9):
because i*2 equal -1
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