Answer
$$(13x+1)(3x-7)=39x^2-88x-7$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}(13x+1)(3x-7)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}39x^2-91x+3x-7 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}39x^2-88x-7\end{aligned} $$ | |
| ① | Multiply each term of $ \left( \color{blue}{13x+1}\right) $ by each term in $ \left( 3x-7\right) $. $$ \left( \color{blue}{13x+1}\right) \cdot \left( 3x-7\right) = 39x^2-91x+3x-7 $$ |
| ② | Combine like terms: $$ 39x^2 \color{blue}{-91x} + \color{blue}{3x} -7 = 39x^2 \color{blue}{-88x} -7 $$ |
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