Question
Answer
$$-5s^2+12st-2t^2+9s^2-9st=4s^2+3st-2t^2$$
Explanation
| $$ \begin{aligned}-5s^2+12st-2t^2+9s^2-9st& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}4s^2+3st-2t^2\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{-5s^2} + \color{red}{12st} -2t^2+ \color{blue}{9s^2} \color{red}{-9st} = \color{blue}{4s^2} + \color{red}{3st} -2t^2 $$ |
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