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Δ=1+24=25
√Δ=5
x₁=1+5/2=3
x₂=1-5/2=-2
G(x)=(x-3)(x+3)(x-3)(x+2)=(x-3)²(x+3)(x+2)
x₁=1+5/2=3 pierw. podwójny
x₂=1-5/2=-2
x₃=-3