D=b^2-4*a*c=(-4)^2-4*3*(-4)=16+48=64
x1=(4-sqrt64)/(2*3)=-2/3
x2=(4+sqrt64)/(2*3)=12/6=2
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D=b^2-4*a*c=(-4)^2-4*3*(-4)=16+48=64
x1=(4-sqrt64)/(2*3)=-2/3
x2=(4+sqrt64)/(2*3)=12/6=2