Question

( x + 2 ) . ( 2x - 6 ) = 0

Answer 1

x=-2 hoặc x=3

Answer 2

\(\Leftrightarrow\left[{}\begin{matrix}x+2=0\\2x-6=0\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=-2\\2x=6\end{matrix}\right.\)

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

Answer 3

TH1:

x = 2 = 0

x = 0 - 2

x = -2

TH2: 

2x - 6 = 0

2x      = 0 + 6

2x      = 6

x         = 6 : 2

x         = 3

 

 

Answer 4

x= -2,x=3