\(\Leftrightarrow\left[{}\begin{matrix}\left\{{}\begin{matrix}x-3>0\\x+4>0\end{matrix}\right.\\\left\{{}\begin{matrix}x-3< 0\\x+4< 0\end{matrix}\right.\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x>3\\x< -4\end{matrix}\right.\)
Vậy \(x>3\) hoặc \(x< -4\) thì BPT xảy ra