Question

23-3./2x+6/=-7

Answer 1

23 - 3|2x + 6| = -7

=> 3|2x + 6| = 23 + 7

=> 3|2x + 6| = 30

=> |2x + 6| = 30 : 3

=> |2x + 6| = 10

=> 2x + 6 = 10 hoặc 2x + 6 = -10

+) Nếu 2x + 6 = 10

=> 2x = 10 - 6

=> 2x = 4

=> x = 4 : 2 = 2

+) Nếu 2x + 6 = -10

=> 2x = -10 - 6

=> 2x = -16

=> x = -16 : 2 = -8

Vậy x = 2; x = -8

Answer 2

\(23-3\left|2x+6\right|=-7\)

\(\Rightarrow3\left|2x+6\right|=23+7\)

\(\Rightarrow3\left|2x+6\right|=30\)

\(\Rightarrow\left|2x+6\right|=10\)

\(\Rightarrow\left|2x\right|=4\)

\(\Rightarrow\left|x\right|=2\)

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

Vậy, x = 2 hoặc x = -2.

Answer 3

23-3./2x + 6/= -7

3./2x+6/=23-(-7)

3./2x + 6/=30

/2x+6/= 30:3

/2x+6/=10

Trường hợp 1:

2x + 6 = 10

2x = 10 - 6

2x = 4

x = 4:2

=> x = 2

Trường hợp 2:

2x + 6 = -10

2x = -10 - 6

2x = -16

x = -16 : 2

=> x = -8

Vậy x = 2 ; x = -8