Question

( x - 1 ) ²   = x - 1

 

Answer 1

Giải chi tiết ra hộ mình

Answer 2

( X - 1 )²  = X - 1

=>x²  - 2x +1 +x+1 = 0

=>x² - x + 2 = 0

=> x² - 2x +x - 2 = 0

=> (x² - 2x) +(x - 2)=0

=>x(x-2)+(x-2)=0

=>(x+1)=0 Hoặc x-2=0

=>x=-1 Hoặc x=2

Answer 3

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

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

\(\Rightarrow x^2-2x+1-x+1=0\)

\(\Rightarrow x^2-2x-x+2=0\)

\(\Rightarrow\left(x^2-x\right)-\left(2x-2\right)=0\)

\(\Rightarrow x\left(x-1\right)-2\left(x-1\right)=0\)

\(\Rightarrow\left(x-1\right)\left(x-2\right)=0\)

\(\Rightarrow\orbr{\begin{cases}x-1=0\\x-2=0\end{cases}\Rightarrow\orbr{\begin{cases}x=1\\x=2\end{cases}}}\)