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y=x2
y2-8y+16=0
delta=64-48=16
y1=8-4/2=2
y2=8+4/2=6
x2=2
x=pierwiastek z 2 lub -pierwiastek z 2
x2=6
x= pierwiastek z 6 lub -pierwiastek z 6
x(x-pierwiatek z 2)(x+ pierwiastek z 2)(x -pierwiastek z 6)(x +pierwiastek z 6)=0