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If x2>1?

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Intern
Joined: 08 Jul 2011
Posts: 17

Kudos [?]: 1 [0], given: 9

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12 Feb 2012, 12:00
If X2>1 {X2 being X squarred}

Then X> +/- 1
Isn't it?
Or is it X>1 and X<-1??

Kudos [?]: 1 [0], given: 9

Math Expert
Joined: 02 Sep 2009
Posts: 41892

Kudos [?]: 128852 [1], given: 12183

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12 Feb 2012, 13:21
1
KUDOS
Expert's post
x^2>1 --> x<-1 or x>1. You can look at this in another way: x^2>1 is the same as |x|>1 --> x<-1 or x>1.

Following might be helpful in solving inequalities:
x2-4x-94661.html#p731476
inequalities-trick-91482.html
data-suff-inequalities-109078.html
range-for-variable-x-in-a-given-inequality-109468.html?hilit=extreme#p873535
everything-is-less-than-zero-108884.html?hilit=extreme#p868863
_________________

Kudos [?]: 128852 [1], given: 12183

Intern
Joined: 08 Jul 2011
Posts: 17

Kudos [?]: 1 [0], given: 9

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12 Feb 2012, 22:00
Thanks Bunuel. I think it is clear now.

Kudos [?]: 1 [0], given: 9

Re: If x2>1?   [#permalink] 12 Feb 2012, 22:00
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