Answer:
x = 9, -15
Explanation:
The initial equation is |x + 3| = 12
It means that x + 3 = 12 or -(x + 3) = 12
Then, we can solve each equation to get:
x + 3 = 12
x + 3 - 3 = 12 - 3
x = 9
-(x + 3) = 12
- x - 3 = 12
- x - 3 + 3 = 12 + 3
- x = 15
-1(-x) = -1(15)
x = -15
Therefore, the solutions are x = 9 and x = -15
