Question

(x²-2x+1)-4=0 

Answer 1

(x²-2x+1)-4=0

(x-1)²=4

x-1=2 hoặc x-1=-2

x=3 hoặc x=-1

Answer 2

\(\left(x^2-2x+1\right)-4=0\)

\(\Leftrightarrow\left(x-2\right)^2-4=0\)

\(\Leftrightarrow\left(x-2+4\right)\left(x-2-4\right)=0\)

\(\Leftrightarrow\left(x+2\right)\left(x-6\right)=0\)

\(\Leftrightarrow\orbr{\begin{cases}x+2=0\\x-6=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=-2\\x=6\end{cases}}}\)

Answer 3

\(\left(x^2-2x+1\right)-4=0\)

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

\(x.\left(x-1\right)-\left(x-1\right)=4\)

\(\left(x-1\right)^2=4\)

=> \(\orbr{\begin{cases}x-1=2\\x-1=-2\end{cases}}\)=> \(\orbr{\begin{cases}x=3\\x=-1\end{cases}}\)

Answer 4

x=3 hoặc x=-1

Answer 5

bấm máy ra thì biết