a/ \(\left(x+5\right)\left(x-4\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x+5=0\\x-4=0\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}x=-5\\x=4\end{matrix}\right.\)
Vậy ........
b/ \(x\left(x+1\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x+1=0\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}x=0\\x=-1\end{matrix}\right.\)
c/ \(\left(x+2\right)\left(x+5\right)>0\)
\(\Leftrightarrow\left[{}\begin{matrix}\left\{{}\begin{matrix}x+2< 0\\x+5< 0\end{matrix}\right.\\\left\{{}\begin{matrix}x+5>0\\x+2>0\end{matrix}\right.\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}\left\{{}\begin{matrix}x< -2\\x< -5\end{matrix}\right.\\\left\{{}\begin{matrix}x>-5\\x>-2\end{matrix}\right.\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}x< -5\\x>-2\end{matrix}\right.\)
Vậy ..
