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Δ=b^2 - 4ac
Δ= 1-0=1
√Δ=1
x1= -b - √Δ / 2a
x1= 1-1/ 2*9= 0/18=0
x2= -b + √Δ / 2a
x2= 1+1/ 2*9= 2/18= 1/9