\(\Rightarrow x+3\ge4\\ \Rightarrow x\ge1\)
\(\left|x+3\right|\ge4\)
\(\Leftrightarrow\left[{}\begin{matrix}x+3\ge4\\x+3\le4\end{matrix}\right.\)\(\Leftrightarrow\left[{}\begin{matrix}x\ge1\\x\le1\end{matrix}\right.\)
cảm ơn các bn đã giúp mik nhìu nha
Ta có: \(\left|x+3\right|\ge4\)
\(\Leftrightarrow\left[{}\begin{matrix}x+3\ge4\\x+3\le-4\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x\ge1\\x\le-7\end{matrix}\right.\)