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x^2-12x+35-15=0
x^2-12x+20=0
delta=b^2-4ac
delta=144-80=64
Vd=V64 V- pierwiastek
Vd=8
x1=(-b+Vd)/2a=(12+8)/2=20/8=10
x2=(-b-Vd)/2a=(12-8)/2=4/2=2