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mitchelsewbaran
Group Title
Find the product of the complex number and its conjugate.
3 + 3i
 one year ago
 one year ago
mitchelsewbaran Group Title
Find the product of the complex number and its conjugate. 3 + 3i
 one year ago
 one year ago

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whpalmer4 Group TitleBest ResponseYou've already chosen the best response.0
The complex conjugate of a+bi is a  bi. The product of a complex number and its conjugate will be \[(a+bi)(abi)=a^2abi+abi+b^2i^2=a^2b^2\]
 one year ago

mitchelsewbaran Group TitleBest ResponseYou've already chosen the best response.0
9  9i?
 one year ago

whpalmer4 Group TitleBest ResponseYou've already chosen the best response.0
Sorry, I made a sign mistake, that should be \[(a+bi)(abi)= a^2abi+abib^2i^2=a^2+b^2\]
 one year ago

whpalmer4 Group TitleBest ResponseYou've already chosen the best response.0
So you have a = 3, b = 3, and the result is 3^2+3^2=18
 one year ago

whpalmer4 Group TitleBest ResponseYou've already chosen the best response.0
the i terms cancel out, and the i^2 term just changes sign because i^2= 1
 one year ago
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