l 2x -3 l -5= Bilangan mutlak bang

Bab Nilai Mutlak
Matematika SMA Kelas X

|2x - 3| - 5 = 0
|2x -3| = 5
(2x - 3)² = 5²
(2x - 3)² - 5² = 0
(2x - 3 + 5) (2x - 3 - 5) = 0
(2x + 2) (2x - 8) = 0
2x + 2 = 0
2x = - 2
x = - 1

2x - 8 = 0
2x = 8
x = 4

HP = { -1, 4 }