Nilai x yg memenuhi |12x- 9| = 3/5

Materi : Persamaan Mutlak

Pembahasan :
|12x - 9| = 3/5
|3| |4x - 3| = 3/5
|4x - 3| = 1/5
(4x - 3)² = (1/5)²
(4x - 3)² - (1/5)² = 0
(4x - 3 + 1/5)(4x - 3 - 1/5) = 0
(4x - 14/5)(4x - 16/5) = 0
x = 7/10
x = 4/5

Hp : {4/5 , 7/10}