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# if |x + 1 | > 2x - 1, which of the following represents the correct

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Director
Joined: 09 Mar 2017
Posts: 539
Location: India
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if |x + 1 | > 2x - 1, which of the following represents the correct  [#permalink]

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Updated on: 18 Aug 2018, 11:37
1
11
00:00

Difficulty:

85% (hard)

Question Stats:

42% (01:51) correct 58% (01:45) wrong based on 143 sessions

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if |x + 1 | > 2x - 1, which of the following represents the correct range of values of x ?

A. x < 0
B. x < 2
C. -2 < x < 0
D. -1 < x < 2
E. 0 < x < 2

Source: ExpertsGlobal

chetan2u,
Shouldn't we consider the overlapping region of (x<0) and (x<2), and the range would then be x < 0 ? Is the OA given wrong ?

_________________

------------------------------
"Trust the timing of your life"
Hit Kudus if this has helped you get closer to your goal, and also to assist others save time. Tq

Originally posted by TaN1213 on 18 Aug 2018, 10:23.
Last edited by TaN1213 on 18 Aug 2018, 11:37, edited 1 time in total.
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if |x + 1 | > 2x - 1, which of the following represents the correct  [#permalink]

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Updated on: 18 Aug 2018, 12:28
2
TaN1213 wrote:
if |x + 1 | > 2x - 1, which of the following represents the correct range of values of x ?

A. x < 0
B. x < 2
C. -2 < x < 0
D. -1 < x < 2
E. 0 < x < 2

Source: ExpertsGlobal

Shouldn't we consider the overlapping region of (x<0) and (x<2), and the range would then be x < 0 ? Is the OA given wrong ?

Given, |x + 1 | > 2x - 1
Or, x+1 > 2x-1 (|x+1|=x+1,when $$(x+1)\geq{0}$$ or, $$x\geq{-1}$$)
Or, 2x-1< x+1
Or, x< 2
So, $$x\ge \:-1\quad \mathrm{and}\quad \:x<2$$-------------(1)

Given, |x + 1 | > 2x - 1
Or, -(x+1) > 2x-1 (|x+1|=-(x+1), when (x+1) < 0 Or, x< -1)
Or, 2x-1< -(x+1)
Or, 2x-1< -x-1
Or, 3x < 0
Or, x < 0
So, $$x<-1\quad \mathrm{and}\quad \:x<0$$----------------(2)

Combining (1) & (2),

$$\left(x<-1\quad \mathrm{and}\quad \:x<0\right)\quad \mathrm{or}\quad \left(x\ge \:-1\quad \mathrm{and}\quad \:x<2\right)$$
So, $$x < 2$$

Ans. (B)
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PKN

Rise above the storm, you will find the sunshine

Originally posted by PKN on 18 Aug 2018, 10:35.
Last edited by PKN on 18 Aug 2018, 12:28, edited 1 time in total.
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Re: if |x + 1 | > 2x - 1, which of the following represents the correct  [#permalink]

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18 Aug 2018, 11:20
1
IMO B
Attachment:

IMG_20180818_235145.jpg [ 56.83 KiB | Viewed 1101 times ]

Sent from my ONEPLUS A3003 using GMAT Club Forum mobile app
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Thank you =Kudos
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Re: if |x + 1 | > 2x - 1, which of the following represents the correct  [#permalink]

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18 Aug 2018, 11:36
PKN wrote:
TaN1213 wrote:
if |x + 1 | > 2x - 1, which of the following represents the correct range of values of x ?

A. x < 0
B. x < 2
C. -2 < x < 0
D. -1 < x < 2
E. 0 < x < 2

Source: ExpertsGlobal

Shouldn't we consider the overlapping region of (x<0) and (x<2), and the range would then be x < 0 ? Is the OA given wrong ?

Given, |x + 1 | > 2x - 1
Or, x+1 > 2x-1 (|x+1|=x+1,when (x+1) > 0)
Or, 2x-1< x+1
Or, x< 2-------------(1)

Given, |x + 1 | > 2x - 1
Or, -(x+1) > 2x-1 (|x+1|=-(x+1), when (x+1) < 0)
Or, 2x-1< -(x+1)
Or, 2x-1< -x-1
Or, 3x < 0
Or, x < 0---------------(2)

From (1) & (2), x < 2

Ans. (B)

Would you please help me understand why aren't we taking the overlap here and choose x<0 ?
_________________

------------------------------
"Trust the timing of your life"
Hit Kudus if this has helped you get closer to your goal, and also to assist others save time. Tq

Math Expert
Joined: 02 Aug 2009
Posts: 6810
Re: if |x + 1 | > 2x - 1, which of the following represents the correct  [#permalink]

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18 Aug 2018, 20:35
1
TaN1213 wrote:
if |x + 1 | > 2x - 1, which of the following represents the correct range of values of x ?

A. x < 0
B. x < 2
C. -2 < x < 0
D. -1 < x < 2
E. 0 < x < 2

Source: ExpertsGlobal

chetan2u,
Shouldn't we consider the overlapping region of (x<0) and (x<2), and the range would then be x < 0 ? Is the OA given wrong ?

Hi...
As correctly done , two critical points..
1) x$$\leq{-1}$$
-(x+1)>2x-1........x+1<1-2x......X<0
So all values below and equal to -1 satisfy the equation
2) x>-1
x+1>2x-1.......x<2
So all values between -1 and 2 satisfy the equation..

Combined..
All values upto -1 inclusive and all values between -1 and 2
So it turns out all values till 2
And that is why both combined give us x<2
_________________

1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html

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Joined: 25 Apr 2018
Posts: 174
Re: if |x + 1 | > 2x - 1, which of the following represents the correct  [#permalink]

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18 Aug 2018, 21:11
chetan2u wrote:
TaN1213 wrote:
if |x + 1 | > 2x - 1, which of the following represents the correct range of values of x ?

A. x < 0
B. x < 2
C. -2 < x < 0
D. -1 < x < 2
E. 0 < x < 2

Source: ExpertsGlobal

chetan2u,
Shouldn't we consider the overlapping region of (x<0) and (x<2), and the range would then be x < 0 ? Is the OA given wrong ?

Hi...
As correctly done , two critical points..
1) x$$\leq{-1}$$
-(x+1)>2x-1........x+1<1-2x......X<0
So all values below and equal to -1 satisfy the equation
2) x>-1
x+1>2x-1.......x<2
So all values between -1 and 2 satisfy the equation..

Combined..
All values upto -1 inclusive and all values between -1 and 2
So it turns out all values till 2
And that is why both combined give us x<2

Hi chetan2u

Whats wrong with this approach.Please explain.
Attachments

IMG_20180819_093657.jpg [ 1.6 MiB | Viewed 970 times ]

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Math Expert
Joined: 02 Aug 2009
Posts: 6810
Re: if |x + 1 | > 2x - 1, which of the following represents the correct  [#permalink]

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18 Aug 2018, 21:31
2
gmat1393 wrote:
chetan2u wrote:
TaN1213 wrote:
if |x + 1 | > 2x - 1, which of the following represents the correct range of values of x ?

A. x < 0
B. x < 2
C. -2 < x < 0
D. -1 < x < 2
E. 0 < x < 2

Source: ExpertsGlobal

chetan2u,
Shouldn't we consider the overlapping region of (x<0) and (x<2), and the range would then be x < 0 ? Is the OA given wrong ?

Hi...
As correctly done , two critical points..
1) x$$\leq{-1}$$
-(x+1)>2x-1........x+1<1-2x......X<0
So all values below and equal to -1 satisfy the equation
2) x>-1
x+1>2x-1.......x<2
So all values between -1 and 2 satisfy the equation..

Combined..
All values upto -1 inclusive and all values between -1 and 2
So it turns out all values till 2
And that is why both combined give us x<2

Hi chetan2u

Whats wrong with this approach.Please explain.

Hi..

You square both sides ONLY when you are sure both sides are positive...
That is the reason you are getting your values when X is positive.
But what about x as negative, 2x-1 will be negative too at those values.

So REMEMBER, do not square when both sides are not 100% to be positive
_________________

1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html

GMAT online Tutor

Manager
Joined: 10 Jan 2013
Posts: 90
Location: India
Concentration: General Management, Strategy
GMAT 1: 600 Q43 V30
GPA: 3.95
Re: if |x + 1 | > 2x - 1, which of the following represents the correct  [#permalink]

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18 Aug 2018, 21:34
Hi chetan2u.

I consistently get these mod questions and inequalities questions wrong. Could you please guide me as to how to improve and practice(i dont want to practice QUESTION PACK questions for these topics)

Posted from my mobile device
Director
Joined: 09 Mar 2017
Posts: 539
Location: India
Concentration: Marketing, Organizational Behavior
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Re: if |x + 1 | > 2x - 1, which of the following represents the correct  [#permalink]

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18 Aug 2018, 22:02
chetan2u wrote:
TaN1213 wrote:
if |x + 1 | > 2x - 1, which of the following represents the correct range of values of x ?

A. x < 0
B. x < 2
C. -2 < x < 0
D. -1 < x < 2
E. 0 < x < 2

Source: ExpertsGlobal

chetan2u,
Shouldn't we consider the overlapping region of (x<0) and (x<2), and the range would then be x < 0 ? Is the OA given wrong ?

Hi...
As correctly done , two critical points..
1) x$$\leq{-1}$$
-(x+1)>2x-1........x+1<1-2x......X<0
So all values below and equal to -1 satisfy the equation
2) x>-1
x+1>2x-1.......x<2
So all values between -1 and 2 satisfy the equation..

Combined..
All values upto -1 inclusive and all values between -1 and 2
So it turns out all values till 2
And that is why both combined give us x<2

Thank you so very much for the crisp explanation.
_________________

------------------------------
"Trust the timing of your life"
Hit Kudus if this has helped you get closer to your goal, and also to assist others save time. Tq

Re: if |x + 1 | > 2x - 1, which of the following represents the correct &nbs [#permalink] 18 Aug 2018, 22:02
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