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a fost răspuns

x^2+5x+6=0...............

Răspuns :

a=1
b=5
c=6
Δ=b²-4ac
Δ=5²-4·1·6=25-24=1
x1=(-b+√Δ)/2a=(-5+1)/2=-4/2=-2
x2=(-b-√Δ)/2a=(-5-1)/2=-6/2=-3
S={-3,-2}

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