Answer
$$13x(x+3x-7)=52x^2-91x$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}13x(x+3x-7)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}13x(4x-7) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}52x^2-91x\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{x} + \color{blue}{3x} -7 = \color{blue}{4x} -7 $$ |
| ② | Multiply $ \color{blue}{13x} $ by $ \left( 4x-7\right) $ $$ \color{blue}{13x} \cdot \left( 4x-7\right) = 52x^2-91x $$ |
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