`(x-1)^4 = (x-1)^2`
`=> (x-1)^4 - (x-1)^2 =0`
`=> (x-1)^2 [ (x-1)^2 -1 ] =0`
+) `(x-1)^2 =0`
`=> x-1 =0`
`=> x= 0+1`
`=> x=1`
+) `(x-1)^2 -1 =0`
`=> (x-1)^2 = 1`
`=>` \(\left[ \begin{array}{l}(x-1)^2 = 1^2\\(x-1)^2 =(-1)^2\end{array} \right.\)
`=>` \(\left[ \begin{array}{l}x-1=1\\x-1=-1\end{array} \right.\)
`=>` \(\left[ \begin{array}{l}x=2\\x=0\end{array} \right.\)
Vậy `x=1` hoặc `x=2` hoặc `x=0`
