Question
Answer
$$5x(5x^7+2x^3-9)=25x^8+10x^4-45x$$
Explanation
| $$ \begin{aligned}5x(5x^7+2x^3-9)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}25x^8+10x^4-45x\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{5x} $ by $ \left( 5x^7+2x^3-9\right) $ $$ \color{blue}{5x} \cdot \left( 5x^7+2x^3-9\right) = 25x^8+10x^4-45x $$ |
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