Engenharia

Qual o número complexo z resultante da&nbsp;expressão abaixo:

<img alt="z space equals space top enclose left parenthesis 1 plus 2 i right parenthesis times left parenthesis 2 plus i right parenthesis end enclose" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi»z«/mi»«mo»§#160;«/mo»«mo»=«/mo»«mo»§#160;«/mo»«menclose notation=¨top¨»«mo»(«/mo»«mn»1«/mn»«mo»+«/mo»«mn»2«/mn»«mi»i«/mi»«mo»)«/mo»«mo»§#183;«/mo»«mo»(«/mo»«mn»2«/mn»«mo»+«/mo»«mi»i«/mi»«mo»)«/mo»«/menclose»«/math»" src="https://cdn.mesalva.com/uploads/cache/b30fa301e44b86f787ed8f3f6bfea1e4.png">

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