Question

[02.Tổ 3 - Ngọc Anh]

tìm x 

x^2-2x+1=25

Answer 1

[Liah Nguyen]

\(\Rightarrow\left(x-1\right)^2=\left(\pm5\right)^2\)

\(\Rightarrow\left[{}\begin{matrix}x-1=5\\x-1=-5\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=6\\x=-4\end{matrix}\right.\)