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[tex](x-3) ^{3} +(y+1) ^{3} [/tex]

Răspuns :

Se foloseste mai intai formula:
[tex]a^3+b^3=(a+b)(a^2-ab+b^2) \ si\ se \ obtine: [/tex]

[tex]...=(x-3+y+1)[(x-3)^2-(x-3)(y+1)+(y+1)^2]=[/tex]

[tex]=(x+y-2)(x^2+y^2-xy-7x+5y+13)[/tex]

Am folosit si formulele [tex](a\pm b)^2=a^2\pm 2ab+b^2[/tex]