Ta có:
\(x\left(x+1\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=0\\x+1=0\end{matrix}\right.\) \(\Rightarrow\left[{}\begin{matrix}x=0\\x=-1\end{matrix}\right.\)
Vậy \(\left[{}\begin{matrix}x=0\\x=-1\end{matrix}\right.\).
x . (x + 1) = 0
\(\Rightarrow\) x = 0 hoặc x + 1 = 0
Nếu x + 1 = 0
x = 0 - 1
x = -1
Vậy x = 0 hoặc x = -1