SOLUTION: (3-7i)^2

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Question 685005: (3-7i)^2
Answer by ReadingBoosters(3246) About Me  (Show Source):
You can put this solution on YOUR website!
(3-7i)(3-7i)
Foil
3(3) + 3(-7i) - 7i(3) - 7i(-7i)
9+-+21i+-+21i+%2B+49i%5E2
knowing i+=+sqrt%28-1%29 and i%5E2+=+sqrt%28-1%29%5E2+=+-1
9 - 42i + 49(-1)
9 - 42i - 49
highlight_green%28-40-42i%29

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