| x - 1 | = | 2x - 8 |

x-1 = 2x-8
-1+8=2x-x
7=x

Bab Nilai Mutlak
Matematika SMA Kelas X

|x - 1| = |2x - 8|

(x - 1)² = (2x - 8)²
(x - 1)² - (2x - 8)² = 0
(x - 1 + 2x - 8) (x - 1 - 2x + 8) = 0
(3x - 9) (-x + 7) = 0
3x - 9 = 0   atau   -x + 7 = 0
3x = 9                  -x = - 7
x = 9/3                 x = 7
x = 3

HP = { 3, 7}