SOLUTION: (c+di)(C-di) Multiplication techniqu e Foil

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Question 536729: (c+di)(C-di) Multiplication techniqu
e Foil
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
(c+di)(C-di)
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It's the sum and difference
= c%5E2+-+d%5E2i%5E2
= c%5E2+%2B+d%5E2