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# want to clarify |m| = -m

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Manager
Joined: 10 Sep 2012
Posts: 140

Kudos [?]: 227 [0], given: 17

want to clarify |m| = -m [#permalink]

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16 Dec 2012, 12:12
someone told me that this is THE definition of absolute value and that any number works...

But maybe I'm confused, how can that work with a positive number?

if m=5

|5| = -5

This is not true, any absolute value is positive, and -5 is clearly negative....

I'm sure I'm misguided somewhere, can someone shine a light?

Kudos [?]: 227 [0], given: 17

SVP
Affiliations: HEC
Joined: 28 Sep 2009
Posts: 1635

Kudos [?]: 688 [0], given: 432

Concentration: Economics, Finance
GMAT 1: 730 Q48 V44
Re: want to clarify |m|= -m [#permalink]

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16 Dec 2012, 13:02
While a tad redundant, here's my definition: the absolute value of a real number is the the non-negative value of said number, without regards to its sign.

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Kudos [?]: 688 [0], given: 432

Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 7736

Kudos [?]: 17795 [1], given: 235

Location: Pune, India
Re: want to clarify |m| = -m [#permalink]

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17 Dec 2012, 04:01
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Expert's post
anon1 wrote:
someone told me that this is THE definition of absolute value and that any number works...

But maybe I'm confused, how can that work with a positive number?

if m=5

|5| = -5

This is not true, any absolute value is positive, and -5 is clearly negative....

I'm sure I'm misguided somewhere, can someone shine a light?

This is not the complete definition. Here it is:

|x| = x if x >= 0
|x| = -x is x < 0

e.g. if x = 5, |x| = x i.e. |5| = 5
if x = -5, |x| = -x i.e. |-5| = -(-5) = 5
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Kudos [?]: 17795 [1], given: 235

Re: want to clarify |m| = -m   [#permalink] 17 Dec 2012, 04:01
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