sorry, a little mistake, should be
Z4-8z3+27z2-50z+50=(z2-6z+10)(z2-2z+5) =(z-3-i)(z-3+i)(z-1-2i)(z-1+2i)=0
sorry, a little mistake, should be
Z4-8z3+27z2-50z+50=(z2-6z+10)(z2-2z+5) =(z-3-i)(z-3+i)(z-1-2i)(z-1+2i)=0
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