Question

(X+7).(14-2x)=0

Answer 1

\(\left(x+7\right)\left(14-2x\right)=0\\ \Rightarrow\left[{}\begin{matrix}x+7=0\\14-2x=0\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=-7\\-2x=-14\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=-7\\x=7\end{matrix}\right.\)

Vậy \(x\in\left\{-7;7\right\}\)

Answer 2

(X+7).(14-2x)=0

x+7=0 hoặc 14+2x=0

=>x=0-7 hoặc 2x=0+14

=>x=-7   hoặc 2x=14

=>x=-7 hoặc x=7

vậy x=-7 ; x=7