|3×+1|=10 berapakah nilai mutlaknya?

Materi : Persamaan Mutlak

Pembahasan :
|3x + 1| = 10
(3x + 1)² = 10²
(3x + 1)² - 10² = 0
(3x + 1 + 10)(3x + 1 - 10) = 0
(3x + 11)(3x - 9) = 0
x = -11/3
x = 3

Hp : {-11/3 , 3}

3x + 1 = 10
3x = 10-1
3x = 9x
x = 9/3
x = 3

3x + 1 = -10
3x = -10-1
3x = -11
x = -11/3

Hp{ -11/3, 3}