Answer
$$3(7x^5y-2x)-x+4=21x^5y-7x+4$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}3(7x^5y-2x)-x+4& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}21x^5y-6x-x+4 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}21x^5y-7x+4\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{3} $ by $ \left( 7x^5y-2x\right) $ $$ \color{blue}{3} \cdot \left( 7x^5y-2x\right) = 21x^5y-6x $$ |
| ② | Combine like terms: $$ 21x^5y \color{blue}{-6x} \color{blue}{-x} +4 = 21x^5y \color{blue}{-7x} +4 $$ |
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