Question

Resolva:

a) 4x - 1 + 2.(1-3x) < 0

b) - 2 < 3x + 1 < 2

Answer 1

a) 4x - 1 + 2.(1-3x) < 0

4x-1+2-6x<0

-2x<-1

x>1/2

 b) - 2 < 3x + 1 < 2

-2<3x+1

3x>-3

x>-3

3x+1<2

3x<1

x<1/3

Resposta   -3 <  x<1/3