tentukan nilai x yang memenuhi persamaan 4 + | 12x + 6| = 4 + | 12x|

Bab Nilai Mutlak
Matematika SMA kelas X

4 + |12x + 6| = 4 + |12x|
|12x + 6| = 4 - 4 + |12x|
|12x + 6| = |12x|

(12x + 6)² = (12x)²
(12x + 6)² - (12x)² = 0
(12x + 6 + 12x) (12x + 6 - 12x) = 0
(24x + 6) . 6 = 0
24x = -6
x = -6/24
x = -1/4

HP = { -1/4 }