Pertidak samaan |x-20|<6

Bab Nilai Mutlak
Matematika SMA Kelas X

|x - 20| < 6

-6 < x - 20 < 6
-6 + 20 < x - 20 + 20 < 6 + 20
14 < x < 26

HP = { x | 14 < x < 26, x ∈ bilangan real }

x-20 < 6
x < 6+20
x < 26