$$ \begin{aligned}-8\sqrt{6}\cdot(6+\sqrt{6})& \xlongequal{ }-(48\sqrt{6}+48) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-48\sqrt{6}-48\end{aligned} $$ | |
① | Remove the parenthesis by changing the sign of each term within them. |