Question

\(|2x-3|=7\)

Answer 1

\(\Leftrightarrow2x-3=7hay2x-3=-7\)

\(\Leftrightarrow2x=10hay2x=-4\)

\(\Leftrightarrow x=5hayx=-2\)

Answer 2

=> 2x - 3 = 7          hoặc 2x -3 = -7  

     2x = 3 + 7                   2x = 3 +(-7)

     2x = 10                        2x = -4

       x = 10 : 2                    x = -4 : 2

      x=5                                  x=-2

Answer 3

Answer 4

\(\left|2x-3\right|=7\)

\(\Leftrightarrow\left[{}\begin{matrix}2x-3=7\\2x-3=-7\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}2x=10\\2x=-4\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=5\\x=-2\end{matrix}\right.\)

Answer 5

|2x - 3| = 7

<=> 2x - 3 = 7 hoặc 2x - 3 = -7

<=> `2x = 10` hoặc `2x = -4`

<=> x = 5 hoặc x = -2

Vậy S = {5 ; -2}