which of the binomials below is a factor of this trinomial x^2=3x-40

whats is the answer for this equation
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x^2 -3x +40=0... quadratik equashun giv roots=1.5+-6.1441029 i (komplex variabels)... b^2-4ac=-151, sqrt(-151)==-12.288205727i... root/2a=6.144102863722
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