`\text{cho }f(x)=g(x)`
`to4x^3-x^2+2x-5=4x^3+2x^2-x-5`
`to4x^3-x^2+2x-4x^3-2x^2+x=-5+5`
`to(4x^3-4x^3)+(-x^2-2x^2)+(2x+x)=0`
`to-3x^2+3x=0`
`to3x(-x+1)=0`
\(\to\left[ \begin{array}{l}3x=0\\-x+1=0\end{array} \right.\) `<=>`\(\left[ \begin{array}{l}x=0\\x=1\end{array} \right.\)
`text{Vậy }x={0;1}text{ khi }f(x)=g(x)`