Question

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

Answer 1

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}