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f(0)=0+0-4= A(0,-4)
z osia OX f(x)=0
x³+3x²-4=0
W(1)=0 z tw Bezouta
(x³+3x²-4):(x-1)=x²+4x+4
x³-x²
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4x²-4
4x²-4x
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4x-4
(x+2)²=0
x2=-2
B(-2,0) C(1,0)