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Elevando al cubo ambos miembros de la igualdad
a+b =2
(a+b)³=2³
a³+b³+3ab(a+b)=8
a³+b³+3·3·2=8
a³+b³+18=8
a³+b³=-10
(a₊b)³=2³
a³₊b³₊3ab(a₊b)=8
a³₊b³₊3(3)(2)=8
a³₊b³₊18=8
a³₊b³=8-18
a³₊b³=-10
Rpta: a³₊b³=-10