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W(x)*P(x)=(4x²-4)*(x³+x²-1)=4x⁵+4x⁴-4x²-4x³-4x²+4=4x⁵+4x⁴-4x³-8x²+4
zad 3a
2x⁴+12x³+18x²=2x²(x²+6x+9)=2x²(x+3)(x+3)
zad 4a
6x³-5x²+6x-5=0
x²(6x-5)+ (6x-5)=0
(x²+1)(6x-5)=0
x²+1=0 6x-5=0
x²=-1 6x=5
sprzeczne x=⅚