ĐK: \(\left\{{}\begin{matrix}x-3\ge0\\\left(4-x\right)\sqrt{2x+4}\ne0\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}x\ge3\\\left[{}\begin{matrix}x\ne4\\x\ge-2\end{matrix}\right.\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}x\ge3\\x\ne4\end{matrix}\right.\)
TXĐ: D = [3;4)\(\cup\left(4;+\infty\right)\)