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b)x(x^2+3x+2)=0 x(x+2)(x+1)=0 czyli x=0,x=1,x=2
c)x^2(x^2-4x-5) x^2(x+1)(x-5) czyli x=-1x=0,x=5
d) -3x^2(x^2-2x-3) -3x^2(x+1)(x-3) czyli x=-1,x=0,x=3