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Is the negative number x less than –1?

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Is the negative number x less than –1?  [#permalink]

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New post 14 May 2017, 12:24
00:00
A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

60% (01:52) correct 40% (01:22) wrong based on 49 sessions

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Re: Is the negative number x less than –1?  [#permalink]

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New post 14 May 2017, 12:35
Bunuel wrote:
Is the negative number x less than –1?

(1) 1/x < 1/2
(2) 1/x^2 < 1/2


E

1. stmt 1 will hold true for x=-2 and for x=-0.5
insufficient

2. for x<-2, the given condition holds true
for -2<x<-1, the given condition fails,
for -1<x<0, the condition condition fails
insufficient

1&2 clearly insufficient
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Re: Is the negative number x less than –1?  [#permalink]

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New post 15 May 2017, 02:03
1
IMO B

x has to be less than -1from statetment 2

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Re: Is the negative number x less than –1?  [#permalink]

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New post 15 May 2017, 02:25
Statement 1:
1/x-1/2<0
2-x/2x<0
As x<0
This gives us
x<2
No new information
Insufficient
Statement 2:
1/x^2-1/2<0
x^2>2
This confirms x<-1
Sufficient
B
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Re: Is the negative number x less than –1?  [#permalink]

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New post 15 May 2017, 02:34
1
For me its B
if 1/x^2 < 1/2 then we can write this as
x^2 > 2...and it is only possible when x is > 1 and as we are given that x is negative this means x is negative number greater than 1
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Re: Is the negative number x less than –1?  [#permalink]

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New post 15 May 2017, 03:05
IMO its B -

1- \(1/x < 1/2\)
\(2/x < 1\)
\(x < 2\) -- we flip signs because we know X is negative and we're taking negative to the other side, or so I think we should do.

2- \(1/x^2 < 1/2\)

flipping sides, sign remains the same since we're dealing with \(x^2\)

\(x^2 > 2\) taking under root, we will be flipping the sign since we know x is negative.
\(x < 1.41\) - Not sufficient.


Combining both, we know x < 2 and and less than 1.41 but its still not sufficient to determine if X is less than -1. Answer should be E IMO. I may be making a dumb mistake so would love it if someone can correct me.
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Re: Is the negative number x less than –1?  [#permalink]

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New post 15 May 2017, 04:29
gmatexam439 wrote:
Bunuel wrote:
Is the negative number x less than –1?

(1) 1/x < 1/2
(2) 1/x^2 < 1/2


E

1. stmt 1 will hold true for x=-2 and for x=-0.5
insufficient

2. for x<-2, the given condition holds true
for -2<x<-1, the given condition fails,
for -1<x<0, the condition condition fails
insufficient

1&2 clearly insufficient



I understand it should be "B" and not "E".
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1. Useful Formulae, Concepts and Tricks-Quant
2. e-GMAT's ALL SC Compilation
3. LSAT RC compilation
4. Actual LSAT CR collection by Broal
5. QOTD RC (Carcass)
6. Challange OG RC
7. GMAT Prep Challenge RC

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Re: Is the negative number x less than –1? &nbs [#permalink] 15 May 2017, 04:29
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