Answer
$$x(x^2+2x+1)=x^3+2x^2+x$$
Explanation
| $$ \begin{aligned}x(x^2+2x+1)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}x^3+2x^2+x\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{x} $ by $ \left( x^2+2x+1\right) $ $$ \color{blue}{x} \cdot \left( x^2+2x+1\right) = x^3+2x^2+x $$ |
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