Answer
$$d^2+6d+9+d^3+6d+9=d^3+d^2+12d+18$$
Explanation
| $$ \begin{aligned}d^2+6d+9+d^3+6d+9& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}d^3+d^2+12d+18\end{aligned} $$ | |
| ① | Combine like terms: $$ d^2+ \color{blue}{6d} + \color{red}{9} +d^3+ \color{blue}{6d} + \color{red}{9} = d^3+d^2+ \color{blue}{12d} + \color{red}{18} $$ |
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