Bài 2:
\(a,\Leftrightarrow x-1=-2\Leftrightarrow x=-1\\ c,\Leftrightarrow\sqrt{x}\left(\sqrt{x}-3\right)=0\left(x\ge0\right)\Leftrightarrow\left[{}\begin{matrix}\sqrt{x}=0\\\sqrt{x}=3\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=0\\x=9\end{matrix}\right.\left(tm\right)\)
Bài 2:
a: =>x-1=-2
hay x=-1
c: =>x=0 hoặc x=9