Answer
$$-w^2+2wm-w\cdot2s-m^2+2sm-s^2=-m^2+2ms+2mw-s^2-2sw-w^2$$
Explanation
| $$ \begin{aligned}-w^2+2wm-w\cdot2s-m^2+2sm-s^2& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-m^2+2ms+2mw-s^2-2sw-w^2\end{aligned} $$ | |
| ① | Combine like terms: $$ -m^2+2ms+2mw-s^2-2sw-w^2 = -m^2+2ms+2mw-s^2-2sw-w^2 $$ |
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