Answer
$$13x(3x-7)=39x^2-91x$$
Explanation
| $$ \begin{aligned}13x(3x-7)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}39x^2-91x\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{13x} $ by $ \left( 3x-7\right) $ $$ \color{blue}{13x} \cdot \left( 3x-7\right) = 39x^2-91x $$ |
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