|x| = -x

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Pilly: Newbie | Next Rank: 10 Posts; Posts: 5; Joined: Tue Jul 03, 2012 8:52 pm

by Pilly » Sat Jul 14, 2012 1:12 pm

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.

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Source: Beat The GMAT — Data Sufficiency | Sat Jul 14, 2012 1:12 pm

eagleeye: Legendary Member; Posts: 520; Joined: Sat Apr 28, 2012 9:12 pmFollowed by: 49 members; Thanked: 339 times; GMAT Score:770

by eagleeye » Sat Jul 14, 2012 1:15 pm

Pilly wrote: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

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