Question

2|x-3|+(-12-6)=0

Answer 1

2|x-3|+(-12-6)=0

2|x-3| = 0 - (-12-6)

2|x-3| = 0 + (12+6)

2|x-3|= 18

|x-3| = 18 : 2

|x-3| = 9

x-3=9

x=9+3

x=12

Vậy: x=12

Answer 2

Cái trước mình viết thiếu, xin lỗi bạn

2|x-3|+(-12-6)=0

2|x-3| = 0 - (-12-6)

2|x-3| = 0 + (12+6)

2|x-3| = 18

|x-3| = 18 : 2

|x-3| = 9

TH_1: TH₂:

x - 3 = 9 x - 3 = -9

x = 9 + 3 x = (-9)+3

x = 12 x = -6

Vậy: x = 12 hoặc x = -6

Answer 3

Theo đề ta có:

2|x-3|+(-12-6)=0

=> \(\left[{}\begin{matrix}\text{2|x-3|+(-18)=0}\\\Rightarrow2\left|x-3\right|=0-\left(-18\right)\\\Rightarrow2\left|x-3\right|=0+18\\\Rightarrow2\left|x-3\right|=18\end{matrix}\right.\)

=> \(\left[{}\begin{matrix}\Rightarrow\left|x-3\right|=\dfrac{18}{2}\\\Rightarrow\left|x-3\right|=9\\\end{matrix}\right.\)

=> \(\left[{}\begin{matrix}x-3=9\\x-3=-9\end{matrix}\right.\)

=> \(\left[{}\begin{matrix}x=9+3\\x=-9+3\end{matrix}\right.\)

=> \(\left[{}\begin{matrix}x=12\\x=-6\end{matrix}\right.\)