| $$ \begin{aligned}-\sqrt{512}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-16\sqrt{2}\end{aligned} $$ | |
| ① | $$ - \sqrt{512} =
- \sqrt{ 16 ^2 \cdot 2 } =
- \sqrt{ 16 ^2 } \, \sqrt{ 2 } =
- 16 \sqrt{ 2 }$$ |