Forma para mayor igual ;
| a | ≥ b ---> a > b ^ a < -b
Forma para menor :
| a | < b ----> -a < b < a. [ b>0 ]
_____________
Ejercicio 1:
| 5x-1 | ≥ 9
5x-1 ≥ 9
x ≥ 2
_______
|5x -1 | ≥ 9
5x-1 ≤ -9
x ≤ -8/5
C.S : < -∞ ; -8/5 ] U [ 2 ; ∞ >
__________
Ejercicio 2:
|3x+6 | > 15
3x+6 > 15
x > 3
3x+6 < -15
x < -7
C.S : < -∞ ; -7 > U < 3 ; ∞ >
________
Ejercicio 3 !!
| x -8 | < 1
1 > 0 → ✓
| x-8 | < 1
-1 < x-8 < 1
7 < x < 9
C.S < 7 ; 9 >
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Forma para mayor igual ;
| a | ≥ b ---> a > b ^ a < -b
Forma para menor :
| a | < b ----> -a < b < a. [ b>0 ]
_____________
Ejercicio 1:
| 5x-1 | ≥ 9
5x-1 ≥ 9
x ≥ 2
_______
|5x -1 | ≥ 9
5x-1 ≤ -9
x ≤ -8/5
C.S : < -∞ ; -8/5 ] U [ 2 ; ∞ >
__________
Ejercicio 2:
|3x+6 | > 15
3x+6 > 15
x > 3
_______
|3x+6 | > 15
3x+6 < -15
x < -7
C.S : < -∞ ; -7 > U < 3 ; ∞ >
________
Ejercicio 3 !!
| x -8 | < 1
1 > 0 → ✓
| x-8 | < 1
-1 < x-8 < 1
7 < x < 9
C.S < 7 ; 9 >