Answer
$$(x^1+x^2+x^3+x^4)x^4=x^8+x^7+x^6+x^5$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}(x^1+x^2+x^3+x^4)x^4& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}x^5+x^6+x^7+x^8 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}x^8+x^7+x^6+x^5\end{aligned} $$ | |
| ① | $$ \left( \color{blue}{x+x^2+x^3+x^4}\right) \cdot x^4 = x^5+x^6+x^7+x^8 $$ |
| ② | Combine like terms: $$ x^8+x^7+x^6+x^5 = x^8+x^7+x^6+x^5 $$ |
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