Answer
$$15x(x+8x-7)=135x^2-105x$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}15x(x+8x-7)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}15x(9x-7) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}135x^2-105x\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{x} + \color{blue}{8x} -7 = \color{blue}{9x} -7 $$ |
| ② | Multiply $ \color{blue}{15x} $ by $ \left( 9x-7\right) $ $$ \color{blue}{15x} \cdot \left( 9x-7\right) = 135x^2-105x $$ |
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