Data Sufficiency (DS) | Re: What is the value of |x| ?

HIBunuel

Can you validate my understanding?
(1) x = -|x|
|x| can be a positive or negative no . (based on x>0 or x<0) but since we do not have
an unique value for x, st 1 is insufficient.


(2) x^2 = 4
We took square root on LHS and RHS to get
|x| = 2 (-2 is not possible on GMAT since square root of negative no shall yield complex no and
we deal with only real nos)
Since we got an unique answer, st 2 is sufficient