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# If xy not= 0, is /x/*y^2 positive?? i have a fundmental

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SVP
Joined: 05 Jul 2006
Posts: 1516
Followers: 5

Kudos [?]: 124 [0], given: 39

If xy not= 0, is /x/*y^2 positive?? i have a fundmental [#permalink]  14 Sep 2006, 08:32
If xy not= 0, is /x/*y^2 positive??

i have a fundmental question here

my answer is we van never know

because /x/ is -x whenever x<0

and +x whenver x>0

am i right or wut

the officila answer says /x/ is always positive by definition. what am i missing here????????????
Senior Manager
Joined: 07 Jul 2005
Posts: 404
Location: Sunnyvale, CA
Followers: 2

Kudos [?]: 4 [0], given: 0

|x| is always +ve.

When x = 5, |x| = 5, which is +ve
when x = -5, |x| = -(-5) = 5, which is again +ve.
Thus, if x is -ve, then |x| = -x but still that results in a +ve no.
SVP
Joined: 05 Jul 2006
Posts: 1516
Followers: 5

Kudos [?]: 124 [0], given: 39

i guess i need to rest ...thank you very much for the help
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