Answer
$$3x(9x^2+1)=27x^3+3x$$
Explanation
| $$ \begin{aligned}3x(9x^2+1)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}27x^3+3x\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{3x} $ by $ \left( 9x^2+1\right) $ $$ \color{blue}{3x} \cdot \left( 9x^2+1\right) = 27x^3+3x $$ |
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