Tentukan himpunan penyelesaian pertisaksamaan beikut |2x+9|<7

|2x + 9| < 7
-7 < 2x + 9 < 7
-7 - 9 < 2x + 9 - 9 < 7 - 9
-16 < 2x < -2
-16/2 < 2x/2 < -2/2
-8 < x < -1

HP = { -8 < x < -1 }

|2x+9| < 7

••2x+9 < 7
2x < 7 -9
2x < -2
x < -1

••2x+9 > -7
2x+8 > -7 -8
2x > -16
x > -16/2
x > -8

HP = {x| x < -1 atau x > -8} atau {x| -8 < x < -1}

Semoga membantu :)