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a^2+3a+2=(a+1)(a+2)


Răspuns :

[tex]a^2+3a+2=(a+1)(a+2)\\a^2+3a+2=a^2+2a+a+2\\a^2+3a+2=a^2+3a+2\\\implies a\in\Bbb{R}\:(\text{orice numar real satisface relatia})[/tex]