Question

(x+11).(7-3x)=0

Answer 1

\(\Leftrightarrow\left[{}\begin{matrix}x+11=0\\3x=7\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=-11\\x=\dfrac{7}{3}\end{matrix}\right.\)

Answer 2

`( x + 11 ) ( 7 - 3x ) = 0`

`<=>` $\left[\begin{matrix} x+11=0\\7 - 3x =0\end{matrix}\right.$

`<=>` $\left[\begin{matrix} x=-11\\ x=\dfrac{7}{3}\end{matrix}\right.$

Vậy `S = { -11; 7 /[3]}`

Answer 3

x=-11 hoặc x=7/3

Answer 4

`(x  + 11) . (7 - 3x) = 0`

`<=>` `x + 11 = 0 => x = -11`

`<=>` `7 - 3x = 0 => x = 7/3`