Question

Tìm x, biết x ( x – 3 ) – 2x + 6  = 0. Ta được kết quả:

Answer 1

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

Answer 2

\(x\left(x-3\right)-2x+6=0\)

\(x\left(x-3\right)-2\left(x-3\right)=0\)

\(\left(x-3\right)\left(x-2\right)=0\)

⇒\(\left[{}\begin{matrix}x=2\\x=3\end{matrix}\right.\)

Answer 3

\(x\left(x-3\right)-2x+6=0\)

\(x\left(x-3\right)-2\left(x-3\right)=0\)

\(\left(x-3\right)\left(x-2\right)=0\)

\(x-3=0\) \(hoặc\) \(x-2=0\)

\(x=3\) \(hoặc\) \(x=2\)