Question

[nguyễn phúc thành quang]

tap hop D cac so tu nhien x ma 3x+1=7+2x

tap hop C cac so tu nhien x ma (2x-8)*(9-3x)=0

Answer 1

[Sherlockichi Kazukosho]

3x + 1 = 7 + 2x

3x - 2x = 7 - 1

x = 6 

=> D = { 6)

( 2x - 8) . ( 9 - 3x) = 0

\(\Rightarrow\hept{\begin{cases}2x-8=0\\9-3x=0\end{cases}\Rightarrow\hept{\begin{cases}2x=8\\3x=9\end{cases}\Rightarrow}\hept{\begin{cases}x=4\\x=3\end{cases}}}\)

=> C = { 3 ; 4}