penyelesaian persamaan I 6 x - 12 I = I x + 8 I

Bab Nilai Mutlak
Matematika SMA Kelas X

|6x - 12| = |x + 8|

(6x - 12)² = (x + 8)²
(6x - 12)² - (x + 8)² = 0
(6x - 12 + x + 8) (6x - 12 - x - 8) = 0
(7x - 4) (5x - 20) = 0
7x - 4 = 0   atau       5x - 20 = 0
7x = 4                      5x = 20
x = 4/7                     x = 20/5
                                x = 4

HP = { 4/7, 4 }