Question

Answer 1

a) ĐKXĐ: \(3x+9\ge0\Rightarrow x\ge-3\)

b) ĐKXĐ: \(\left\{{}\begin{matrix}-5x-10\ge0\\3x-2\ne0\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x\ge-2\\x\ne\dfrac{2}{3}\end{matrix}\right.\)

c)ĐKXĐ:  \(x^2-9\ge0\Rightarrow x^2\ge9\Rightarrow\left[{}\begin{matrix}x\ge-3\\x\ge3\end{matrix}\right.\Rightarrow x\ge3\)

 

 

Answer 2

a: ĐKXĐ: \(x\ge-3\)

b: ĐKXĐ: \(x\in\varnothing\)

c: ĐKXĐ: \(\left[{}\begin{matrix}x\ge3\\x\le-3\end{matrix}\right.\)

d: ĐKXĐ: \(-2\le x< 5\)