Answer
$$8+3(4k+7)=12k+29$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}8+3(4k+7)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}8+12k+21 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}12k+29\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{3} $ by $ \left( 4k+7\right) $ $$ \color{blue}{3} \cdot \left( 4k+7\right) = 12k+21 $$ |
| ② | Combine like terms: $$ \color{blue}{8} +12k+ \color{blue}{21} = 12k+ \color{blue}{29} $$ |
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