Answer
$$3n^2+6np-np-2p^2=3n^2+5np-2p^2$$
Explanation
| $$ \begin{aligned}3n^2+6np-np-2p^2& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}3n^2+5np-2p^2\end{aligned} $$ | |
| ① | Combine like terms: $$ 3n^2+ \color{blue}{6np} \color{blue}{-np} -2p^2 = 3n^2+ \color{blue}{5np} -2p^2 $$ |
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