|x| = -x

[Pilly]

Hello,

I'm practicing on data sufficiency through veritas prep and I keep getting this equation.

|x| = -x

Does this mean that x is a negative no matter what? I read the explanation from the book and it already assumes that I know what i meant.

[eagleeye]

Hello,

I'm practicing on data sufficiency through veritas prep and I keep getting this equation.

|x| = -x

Does this mean that x is a negative no matter what? I read the explanation from the book and it already assumes that I know what i meant.

Hi Pilly:

You are almost right. It means that x is either negative or equal to 0.


PS: For more information on moduli, you may find the following post useful.
https://www.beatthegmat.com/squares-squa ... tml#476551