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x1=-3
x2=2
W(x)=x3+ax2-4x+b
układamy równanie:
0=-9+-6a+12+b
0=6+4a-8+b
b= 6a-3
0=6+4a-8+ 6a-3
0=10a-5
-10a=-5
a=1/2
b=6*1/2-3
b=0