SOLUTION: (3+10i)(4-9i)

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Question 866711: (3+10i)(4-9i)


Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
%283%2B10i%29%284-9i%29


3%284-9i%29%2B10i%284-9i%29


3%284%29%2B3%28-9i%29%2B10i%284%29%2B10i%28-9i%29


12-27i%2B40i-90i%5E2


12-27i%2B40i-90%28-1%29


12-27i%2B40i%2B90


102%2B13i


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So, %283%2B10i%29%284-9i%29=102%2B13i