\(48x-6x^4=0\)
\(\Leftrightarrow-6x\left(x^3-8\right)=0\)
\(\Leftrightarrow6x\left(x-2\right)\left(x^2+2x+4\right)=0\)
Vì \(x^2+2x+4=\left(x+1\right)^2+3>0\)
\(\Rightarrow6x\left(x-2\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x=2\end{matrix}\right.\)