Question

Se I2x-1I>=3, a solução é?

Answer 1

      2x - 1 >= 3         
       2x >= 4
         x >= 2

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

                     - 1 =< x =<  2

Answer 2

| 2x - 1| >= 3

2x - 1 >= 3
2x >= 3 + 1
2x >= 4
x >= 4/2
x >= 2

2x - 1 >= - 3
2x >= -3 + 1
2x >= - 2
x >= -2/2
x >= - 1

logo:

S = { - 1 =< x >= 2 }