Question

|2x-1|-4=-1

Answer 1

`|2x-1|-4=-1`

`=> |2x-1|=-1+4`

`=> |2x-1|=3`

`@ TH1`

`2x-1=3`

`=> 2x=3+1`

`=>2x=4`

`=>x=4:2`

`=>x=2`

`@ TH2`

`2x-1=-3`

`=> 2x=-3+1`

`=> 2x=-2`

`=>x=-2:2`

`=>x=-1`

Answer 2

=>|2x-1|=3

=>2x-1=3 hoặc 2x-1=-3

=>x=-1 hoặc x=2

Answer 3

|2.x-1|-4=-1

<=>|2.x-1|=3

\(< =>\left[{}\begin{matrix}2.x-1=3\\2.x-1=-3\end{matrix}\right.< =>\left[{}\begin{matrix}2.x=4\\2.x=-2\end{matrix}\right.< =>\left[{}\begin{matrix}x=2\\x=-1\end{matrix}\right.\)

Vậy x∈{2;-1}