bagai mana cra penyelesaian(x+9)=2

kalo persamaan nilai mutlak

|x + 9| = 2
⇒x + 9 = 2
   x = -7
⇒x + 9 = -2
  x = -11

HP = {x = -7 atau x = -11}

Materi : Persamaan Mutlak

Pembahasan :
|x + 9| = 2
(x + 9)² = 2²
(x + 9)² - 2² = 0
(x + 9 + 2)(x + 9 - 2) = 0
(x + 11)(x + 7) = 0
x = -11
x = -7

Hp : {-11 , -7}