Resposta :

MATHSPHIS
[tex](a+x) (a^2-ax+x^2) - (a-x) (a^2+ax+x^2)= \\ \\ a^3-a^2x+ax^2+a^2x-ax^2+x^3-(a^3+a^2x+ax^2-a^2x-ax^2-x^3) = \\ \\ a^3-a^2x+ax^2+a^2x-ax^2+x^3-a^3 -a^2x-ax^2+a^2x+ax^2+x^3= \boxed {2x^3} [/tex]
carloswms2012
[tex](a+x)(a^2-ax+x^2)-(a-x)(a^2+ax+x^2)=\\(a^3-a^2x+ax^2+a^2x-ax^2+x^3)-(a^3+a^2x+ax^2-a^2x-ax^2-x^3)=>\\0[/tex]

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