Question

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

Answer 1

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