SOLUTION: (9-11i)^2

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Question 684061: (9-11i)^2
Answer by ReadingBoosters(3246) About Me  (Show Source):
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(9-11i)(9-11i)
FOIL
9(9) + 9(-11i) - 11i(9) - 11i(-11i)
81+-+99i+-+99i+%2B+121i%5E2
Knowing i%5E2+=+sqrt%28-1%29%5E2+=+-1
81+-+198i+%2B+121%28-1%29
81+-+198i+-+121
...
highlight_green%28-40+-+198i%29
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