4) 2 x + 2 x + 2
[ x −( 1 −)] + 1 ≤ 3 3 9
2 3 − x − 2 [ x −()] + 1 ≤ x + 2
3 3 9
2 3x − 3 + x + 2 [ ] + 1 ≤ x + 2
3 3
9
2 3 [ 4x − 1 ] + 1 ≤ x + 2
3 9
8x + 2 9
8x + 2 + 9 9
+ 1 ≤ x + 2 9
+ 1 ≤ x + 2 9
8x − x |
≤ |
2 + 2 − 9 |
7x |
≤ |
−5 |
x |
≤ |
−
5⁄ 7
|
R = { x ∈ R; x ≤ − 5 7 }
R =( −∞; − 5 ] Intervalo infinito a la izquierda
7
5) −3 ≤ 1
3( 2x + 1) ≤ 3
Forma 1
−3( 3) ≤ 2x + 1 ≤ 3( 3)
−9 ≤ 2x + 1 ≤ 9 −9 − 1 ≤ 2x ≤ 9 − 1
− 10 2 ≤ x ≤ 8
2 −5 ≤ x ≤ 4
39