SOLUTION: Plz show work for (3-7i)(3-7i) or (3 − 7i)^2. Thanks!

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Question 283596: Plz show work for (3-7i)(3-7i) or (3 − 7i)^2. Thanks!
Answer by jim_thompson5910(21685) About Me  (Show Source):
You can put this solution on YOUR website!
%283-7i%29%2A%283-7i%29 Start with the given expression.


%283%29%283%29%2B%283%29%28-7i%29%2B%28-7i%29%283%29%2B%28-7i%29%28-7i%29 FOIL.


9-21i-21i%2B49i%5E2 Multiply.


9-21i-21i%2B49%28-1%29 Replace i%5E2 with -1. Note: i%5E2=-1.


9-21i-21i-49 Multiply.


-40-42i Combine like terms.


So %283-7i%29%2A%283-7i%29=-40-42i.