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3x=(x+2)(x-2)
3x=x²-4
x²-3x-4=0
Δ=(-3)²-4*1*(-4)=9+16=25
√Δ=5
x₁=(3-5):2=-1
x₂=(3+5):2=4
(x+2)(x-2)=3x (mnożenie na krzyż)
x²-2²=3x
x²-3x-4=0
delta=9+16=25
x=(3+5)*½=4 lub x=(3-5)*½=-1