Question

What are the possible values of x in 115-3x = 18 ?-1 < x < 11O-1 >x> 11x= -1 or x = -11x= -1 or x = 11

Answer 1

The expression:

`|15-3x|=18`

To get the value of x

Step 1: solve the expression

`\begin{gathered} 15-3x=18 \\ -3x=18-15 \\ -3x=3 \\ x=-1 \end{gathered}`

Step 2: solve the expression introducing the negative sign

`\begin{gathered} 15-3x=-18 \\ -3x=-18-15 \\ -3x=-33 \\ x=-(33)/(-3)=11 \\ x=11 \end{gathered}`

The answer is:

x=-1 or x =11