x ( x - 2 ) + x - 2 = 0
x ( x - 2 ) + ( x - 2 ) . 1 = 0
( x - 2 ) ( x + 1 ) = 0
\(\Rightarrow\orbr{\begin{cases}x-2=0\\x+1=0\end{cases}}\Rightarrow\orbr{\begin{cases}x=2\\x=-1\end{cases}}\)
Vậy x = 2 ; x = -1
\(x.x-2+x-2=0\)
\(\Leftrightarrow x-2.x+1=0\)
\(=x-2=0\Rightarrow x=0\)
\(=x+1\Rightarrow x=-1\)
\(\Rightarrow x=-1;x=2\)