$$ \begin{aligned}-6\sqrt{144}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-6\cdot12 \xlongequal{ } \\[1 em] & \xlongequal{ }-72\end{aligned} $$ | |
① | The square root of $ 144 $ is $ 12 $. |