Question

× la a doua + 3 × +2=0​

Answer 1

$\it x^2+3x+2=0 \Rightarrow x^2+x+2x+2=0 \Rightarrow x(x+1)+2(x+1)=0 \Rightarrow \\ \\ \Rightarrow (x+1)(x+2)=0 \Rightarrow \begin{cases} \it x+2=0 \Rightarrow x_1=-2\\ \\ \it x+1=0 \Rightarrow x_2=-1\end{cases}$