Question

\(3x+x^2=0\)

Answer 1

$3x+x^2=0$

\(\Rightarrow x.\left(3+x\right)=0\) \(\Rightarrow\left[{}\begin{matrix}x=0\\x+3=0\end{matrix}\right.\) \(\Rightarrow\left[{}\begin{matrix}x=0\\x=-3\end{matrix}\right.\) Vậy \(x=0\) hoặc \(x=-3\)

Answer 2

\(3x+x^2=0\)

\(\Leftrightarrow x.\left(x+3\right)=0\)

\(\Rightarrow x=0\) hoặc \(x=-3\)