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OpenStudy (anonymous):
(4+5i)(4-5i)
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OpenStudy (aroub):
distribute and u will get the answer
OpenStudy (anonymous):
41
OpenStudy (anonymous):
\[16-20i+20i-25i^2=16+25=41\]
jhonyy9 (jhonyy9):
can us (a*2-b*2)=(a+b)x(a-b) and hence you get 4*2-5i*2=16-25i*2=16-25(-1)=16+25=41
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