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a=1
b=3
c=1
Δ=b2-4ac=9-4*1*1=9-4=5
√Δ=√5
x1=-b-√Δ/2a=-3-√5/2
x2=-b+√Δ/2a=-3+√5/2
Δ=3^2 - 4*1*1 = 9-4=5
Δ = b^2 – 4ac
W Twoim przypadku to y=x^2+3x+1 czyli
Δ=3^2-4*1*1=9-4=5