Answer
$$(6x+12)(6x+12)=36x^2+144x+144$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}(6x+12)(6x+12)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}36x^2+72x+72x+144 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}36x^2+144x+144\end{aligned} $$ | |
| ① | Multiply each term of $ \left( \color{blue}{6x+12}\right) $ by each term in $ \left( 6x+12\right) $. $$ \left( \color{blue}{6x+12}\right) \cdot \left( 6x+12\right) = 36x^2+72x+72x+144 $$ |
| ② | Combine like terms: $$ 36x^2+ \color{blue}{72x} + \color{blue}{72x} +144 = 36x^2+ \color{blue}{144x} +144 $$ |
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