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x²(x-3)+6(x-3)=0
(x-3)(x²+6)=0
x²+6 nie ma miejsc zerowych
x-3=0
Odp. x=3
b)
x(5x²-6x+1)=0
x(5x²-5x-x+1)=0
x*[5x(x-1)-(x-1)]=0
x(x-1)(5x-1)=0
x=0 v x-1=0 v 5x-1=0
Odp. x∈{0, 1/5, 1}