i'm really confused on questions like these... Any help guys??

|x| + 5 = 18
A) 5 or -5
B) 13 or -13**
C) 18 or -18
D) 23 or -23
I think b.. I'm not sure if I did it right though..

subtracting 5 ... |x| = 13

so ... x = ± 13

your answer is correct