Question

Answer 1

a) B/t x/đ \(\Leftrightarrow2x+10\ge0\Leftrightarrow x\ge-5\)

b) B/t x/đ \(\Leftrightarrow4x^2-36\ge0\Leftrightarrow x^2\ge9\)  \(\Leftrightarrow\left[{}\begin{matrix}x\le-3\\x\ge3\end{matrix}\right.\)

Answer 2

\(a)\)\(2x+10\ge0< =>2x\ge-10\\ < =>x\ge-5\)

\(b)\)\(4x^2-36\ge0< =>4x^2\ge36\\ < =>x^2\ge9\\ < =>\left|x\right|\ge3\\ < =>\left[{}\begin{matrix}x\ge3\\x\le-3\end{matrix}\right.\)