Lời giải:
$(-x-\frac{1}{2})^2=|-2-\frac{1}{4}|=\frac{9}{4}=(\frac{3}{2})^2=(\frac{-3}{2})^2$
\(\Rightarrow \left[\begin{matrix}
-x-\frac{1}{2}=\frac{3}{2}\\
-x-\frac{1}{2}=\frac{-3}{2}\end{matrix}\right.\Rightarrow \left[\begin{matrix}
x=-2\\
x=1\end{matrix}\right.\)