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How do you evaluate absolute value statements such as these?

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by ogbeni » Sun Sep 20, 2009 11:47 am
1. -M=|-M|

2. |P|=-|Q|

I wrote these down in my notes from some questions I took and I'm now reviewing my notes but seem to have hit a brick wall.

Also, what is the difference between the 2 statements. Per my notes, 1 could be negative or zero. I understand why it would be zero but I don't understand why it could be negative. Statement 2 is unequivocally zero but why not 1?
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Source: — Data Sufficiency |
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by m&m » Mon Sep 21, 2009 11:40 am
absolute signs make any sign inside (+ or -) positive (+).

So in your first example

-M=|-M|

we can simplify |-M| to |M|, so:

-M=|M|

any value of M<=0 works:

-(-1) = |-1|
1 = 1


your second example must be 0:
|P|=-|Q|

1 or -1 will not work because the absolute signs turn anything to a positive

|whatever| = +ve whatever so

+ve = -1*+ve

only 0 will make this equation work

Hope this helps
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by ogbeni » Mon Sep 21, 2009 1:36 pm
Thanks - definitely makes sense!
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