Question 171743: (a+bi)(a-bi)
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! (a+bi)(a-bi)
Use FOIL:
F: a^2
O: -abi
I: +abi
L: -(bi)^2 = b^2
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Combine these to get a^2 + b^2
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Comment: Memorize this form as you will see it many times.
(a+bi)(a-bi) = a^2+b^2
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Cheers,
Stan H.
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