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|x| = -x

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|x| = -x

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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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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