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OpenStudy (anonymous):
is (1+4i)(1-4i)=17 1-4i+4i-16(-1)=1+16=17 right?
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jimthompson5910 (jim_thompson5910):
that is correct
jimthompson5910 (jim_thompson5910):
The shortcut is to use (a-bi)(a+bi) = a^2 + b^2
OpenStudy (anonymous):
thank you
jimthompson5910 (jim_thompson5910):
yw
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