Answer
$$(6a-6)(6a+1)=36a^2-30a-6$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}(6a-6)(6a+1)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}36a^2+6a-36a-6 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}36a^2-30a-6\end{aligned} $$ | |
| ① | Multiply each term of $ \left( \color{blue}{6a-6}\right) $ by each term in $ \left( 6a+1\right) $. $$ \left( \color{blue}{6a-6}\right) \cdot \left( 6a+1\right) = 36a^2+6a-36a-6 $$ |
| ② | Combine like terms: $$ 36a^2+ \color{blue}{6a} \color{blue}{-36a} -6 = 36a^2 \color{blue}{-30a} -6 $$ |
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