Answer
$$-18+9b^2+6=9b^2-12$$
Explanation
| $$ \begin{aligned}-18+9b^2+6& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}9b^2-12\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{-18} +9b^2+ \color{blue}{6} = 9b^2 \color{blue}{-12} $$ |
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