nilai x yang memenuhi persamaan |8 - 5x|-9 = 0

Bab Nilai Mutlak
Matematika SMA Kelas X

|8 - 5x| - 9 = 0
|8 - 5x| = 9
(8 - 5x)² = 9²
(8 - 5x)² - 9² = 0
(8 - 5x + 9) (8 - 5x - 9) = 0
(-5x + 17) (-5x - 1) = 0
-5x + 17 = 0   atau   -5x - 1 = 0
-5x = -17                  -5x = 1
x = -17/-5                 x = -1/5
x = 17/5

HP = { -1/5, 175 }