D=(√3+1)^2-4√3=3+2√3+1-4√3=3-2√3+1=(√3-1)^2
x1=(√3+1+√3-1)/2=√3
x2=(√3+1-√3+1)/2=1
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D=(√3+1)^2-4√3=3+2√3+1-4√3=3-2√3+1=(√3-1)^2
x1=(√3+1+√3-1)/2=√3
x2=(√3+1-√3+1)/2=1