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avatar+227 

Simplify (1 - 3i)(2 - i)(2 + i + 1 + 3i).

 
 Oct 31, 2024
 #1
avatar+14995 
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\((1 - 3i)(2 - i)(2 + i + 1 + 3i)\\ =(1 - 3i)(2 - i)(3+4i)\\ =(2-i-6i-3)(3+4i)\\ =(-1-7i)(3+4i)\\ =(-3-4i-21i+28)\)

\(=25-25i\\ \color{blue}=25(1-i)\)

 

laugh !

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 Nov 1, 2024

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