Question

Tìm x

 

Answer 1

(x-7).(2x-8)=0

\(\left[{}\begin{matrix}x-7=0\\2x-8=0\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=7\\x=4\end{matrix}\right.\)

Answer 2

i: Ta có: \(\left(x-7\right)\left(2x-8\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x-7=0\\x-4=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=7\\x=4\end{matrix}\right.\)