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Inequalities problem from OG 11

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Source: — Data Sufficiency |
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by tanviet » Tue Jan 26, 2010 6:15 am
if x<0, x/x/=x.(-x)= -x^2

-x^2<2x

0<2x+x^2

0<x(2+x)

if -2<x<0, the right <0, if x<-2, the right >0, not sufficient

x=-10, sufficient

answer is B
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by Osirus@VeritasPrep » Tue Jan 26, 2010 6:16 am
Yeah, that's what I got as well, but the Official Guide says the answer is D. I don't get how A is sufficient, unless there is a typo.
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by sreak1089 » Tue Jan 26, 2010 6:22 am
I too got B. What is the question number in OG 11?
osirus0830 wrote:Yeah, that's what I got as well, but the Official Guide says the answer is D. I don't get how A is sufficient, unless there is a typo.
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by Osirus@VeritasPrep » Tue Jan 26, 2010 6:23 am
sreak1089 wrote:I too got B. What is the question number in OG 11?
osirus0830 wrote:Yeah, that's what I got as well, but the Official Guide says the answer is D. I don't get how A is sufficient, unless there is a typo.
128 in the DS section.

The answer explanation talks about raising x to a power, which leads me to believe there is a typo in the prompt.
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by sreak1089 » Tue Jan 26, 2010 6:31 am
In my book, it is 2^x, so it must have been a typo in your book. If it is 2^x, then sure it makes sense coz, x * |x| is -ve when x is -ve or equal to -10 and 2^x is always positive.
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by Osirus@VeritasPrep » Tue Jan 26, 2010 6:32 am
sreak1089 wrote:In my book, it is 2^x, so it must have been a typo in your book. If it is 2^x, then sure it makes sense coz, x * |x| is -ve when x is -ve or equal to -10 and 2^x is always positive.
Ah, ok, thanks a lot. I thought I was crazy for a minute and with the test in 3 days I was getting nervous...lol
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by sreak1089 » Tue Jan 26, 2010 6:40 am
No need to worry, you have got it covered :)
osirus0830 wrote:
sreak1089 wrote:In my book, it is 2^x, so it must have been a typo in your book. If it is 2^x, then sure it makes sense coz, x * |x| is -ve when x is -ve or equal to -10 and 2^x is always positive.
Ah, ok, thanks a lot. I thought I was crazy for a minute and with the test in 3 days I was getting nervous...lol
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