Thay y = 0 vào \(y=5x^5+10x^4\) ta có:
\(\Rightarrow5x^5+10x^4=0\)
\(\Rightarrow5x^4\left(x+2\right)=0\)
\(\Rightarrow\left\{\begin{matrix}5x^4=0\\x+2=0\end{matrix}\right.\Rightarrow\left\{\begin{matrix}x=0\\x=-2\end{matrix}\right.\)
Vậy \(x\in\left\{0;-2\right\}\)