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W(x) = xdo4 - 3xdo3 +5 xdokwadratu - 3x +5-1=(xdo2+1)(xdo2-1)-3x(xdo2+1)+5(xdo2+1)=(xdo2+1)(xdo2-1-3x+5)=(xdo2+1)(xdo2-3x+4)
xdo2+1 nie ma pierwiastkow
xdo2-3x+4
delta=9-4*4=-7
czyli nie ma pierwiastkow