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(2+7i)(2-7i)= ==========
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(2+7i)(2-7i)= ==========

User Shashank Agrawal
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2 Answers

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(2+7i)(2-7i)=4-14i+14i-49i^2\\ \\ 4+49=53
User Itban Saeed
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(2+7i)(2-7i)=2^2-(7i)^2=4-49\vfot(-1)=4+49=53\\\\-------------------------------\\i=√(-1)\\\\i^2=-1
User TiBooX
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