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