Question

Ajutatima aici umpic va rog...

1.Identifica multimile de difinitie :
a)3x+2>2x-3 , x E Z
b)4x+2<1 , x E = {1,2,3}

Answer 1

   
a)
3x + 2 > 2x - 3         x ∈ Z
3x - 2x > -3 - 2
x > -5
x ∈ {-4; -3; -2; -1; 0; 1; 2; 3;  .......}


b)
4x + 2 < 1         x ∈ {1; 2; 3}
4x < 1 - 2
4x < -1
x < -1/4
=>  x ∉  {1; 2; 3}