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Δ=b²-4ac=9+16=25 √Δ=5
x₁=-b-√Δ/2a=-3-5/4=-2
x₂=-3+5/4=½
x²-6x+9=0
Δ=36-36=0
x₀=-b/2a=6/2=3
x²-5x+22=0
Δ=25-88=-63
Δ<0 równanie sprzeczne