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metoda grupowania:
W(x)=3x(x²-2)+1(x²-2)
W(x)=(x²-2)(3x+1)
W(x)=(x-√2)(x+√2)(x+⅓)
pierwiastki wielomianu: -√2,-⅓,√2
b) W(x)=x⁴-x³+4x-4
ta sama metoda co wyżej:
W(x)=x³(x-1)+4(x-1)
W(x)=(x-1)(x³+4)
W(x)=(x-1)(x+∛4)(x-∛4)
pierwiastki wielomianu: -∛4,∛4,1