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Seja z um número complexo dado pela expressão (1). Qual o valor de x&nbsp;segundo a expressão (2)?

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<img alt="left parenthesis 2 right parenthesis colon space space space x space equals space space 4 times z space plus space 4 times z squared space plus space z cubed space plus space z to the power of 4 space plus space open vertical bar z close vertical bar space minus space R e left curly bracket z right curly bracket" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mo»(«/mo»«mn»2«/mn»«mo»)«/mo»«mo»:«/mo»«mo»§#160;«/mo»«mo»§#160;«/mo»«mo»§#160;«/mo»«mi»x«/mi»«mo»§#160;«/mo»«mo»=«/mo»«mo»§#160;«/mo»«mo»§#160;«/mo»«mn»4«/mn»«mo»§#183;«/mo»«mi»z«/mi»«mo»§#160;«/mo»«mo»+«/mo»«mo»§#160;«/mo»«mn»4«/mn»«mo»§#183;«/mo»«msup»«mi»z«/mi»«mn»2«/mn»«/msup»«mo»§#160;«/mo»«mo»+«/mo»«mo»§#160;«/mo»«msup»«mi»z«/mi»«mn»3«/mn»«/msup»«mo»§#160;«/mo»«mo»+«/mo»«mo»§#160;«/mo»«msup»«mi»z«/mi»«mn»4«/mn»«/msup»«mo»§#160;«/mo»«mo»+«/mo»«mo»§#160;«/mo»«mfenced open=¨|¨ close=¨|¨»«mi»z«/mi»«/mfenced»«mo»§#160;«/mo»«mo»-«/mo»«mo»§#160;«/mo»«mi»R«/mi»«mi»e«/mi»«mo»{«/mo»«mi»z«/mi»«mo»}«/mo»«/math»" src="https://cdn.mesalva.com/uploads/cache/229701eab10dee6cc9ce36b4fe29f7dd.png">

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