Respostas

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2013-11-16T19:59:00-02:00
2[ x-1-3i][x-1+3i]
x^2-x+3xi-x+1-3i-3xi+3i-9i^2
x^2-2x+1-9i^2
x^2-2x+1+9
2[x^2-2x+10]
2x^2-4x+20
(-4)^2-4(2).(20)
delta= -144 
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