Answer
$$2\cdot(4+9w)=18w+8$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}2\cdot(4+9w)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}8+18w \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}18w+8\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{2} $ by $ \left( 4+9w\right) $ $$ \color{blue}{2} \cdot \left( 4+9w\right) = 8+18w $$ |
| ② | Combine like terms: $$ 18w+8 = 18w+8 $$ |
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