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a=(-1) b=6 c =1
Δ=6^2-4*(-1)*1=36+4=40 √Δ=√40=√4*10=√2^2*10=2√10
x1=-b-√Δ/2a = -6-2√10/(-2) = -2(3-√10)/-(2)=3-√10
x2=-b+√Δ/2a= -6+2√10/(-2)= -2(3+√10)/(-2)=3+√10