16-07-2014
Mathematics

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

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16-07-2014

[tex](2+7i)(2-7i)=4-14i+14i-49i^2\\ \\ 4+49=53[/tex]

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Аноним Аноним

16-07-2014

[tex](2+7i)(2-7i)=2^2-(7i)^2=4-49\vfot(-1)=4+49=53\\\\-------------------------------\\i=\sqrt{-1}\\\\i^2=-1[/tex]

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