x^3-2x^2-36x+72=0
x²(x-2)-36(x-2)=0
(x²-36)(x-2)=0
(x-6)(x+6)(x-2)=0
x=6 v x=-6 v x=2
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x^3-2x^2-36x+72=0
x²(x-2)-36(x-2)=0
(x²-36)(x-2)=0
(x-6)(x+6)(x-2)=0
x=6 v x=-6 v x=2