| $$ \begin{aligned}-2\sqrt{256}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-2\cdot16 \xlongequal{ } \\[1 em] & \xlongequal{ }-32\end{aligned} $$ | |
| ① | The square root of $ 256 $ is $ 16 $. |