a, `(x-2^2)=1` giúp ạ

`[` Bạn tham khảo `]`

`(x - 2)^2 = 1`

`-> (x - 2)^2 = (+- 1)^2`

`->` \(\left[ \begin{array}{l}x - 2= 1\\x - 2 = -1\end{array} \right.\)

`->` \(\left[ \begin{array}{l}x = 3\\x = 1\end{array} \right.\)

Vậy `x in {1;3}`

`#Eirlys07`