Question

(x^2-2x+1)-4=0

 

Answer 1

\(\left(x^2-2x+1\right)-4=0\\ \Leftrightarrow\left(x-1\right)^2=4\\ \Leftrightarrow\left[{}\begin{matrix}x-1=-2\\x-1=2\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=-1\\x=3\end{matrix}\right.\)

Answer 2

= x^2 - 2x = 3

= x(x-2) = 3 

x= -1 , -3 , 1 , 3

Answer 3

(x^2-2x+1)-4=0 => x^2-2x+1=4 => (x-1)^2=4                    => x-1=2 hoặc x-1=-2 => x=3 hoặc x=-1