Question

tìm x biết 3(x-1)=(x-1)^2

Answer 1

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

Answer 2

3(x-1) = (x-1)²

(x-1)² - 3 (x-1) = 0

(x-1) (x-1-3)=0

x- 1 = 0 hoặc x -1-3 = 0

x -1 = 0 ⇒ x = 1

x -1 -3 = 0 ⇒ x - 4 = 0 ⇒ x = 4

x ϵ {1; 4 }