Question

tìm x

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

Answer 1

x(x-1)-4(x-1)=0

(x-4)(x-1)=0 

=> x-4=0 hoặc x-1=0 

=> x=4 hoặc x= 1

Vậy x = { 4;1}

Answer 2

Answer 3

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