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# If x/|x|<x which of the following must be true about x?

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Re: If x/|x|<x which of the following must be true about x? [#permalink]  13 Jun 2012, 21:05
Expert's post
sanjoo wrote:
But wat if x will be zero?? that will be infinitive..!!..
I think answer a is correct.. m still confused .

The range x > -1 does not imply that every value greater than -1 will satisfy this inequality. It implies that every value that satisfies this inequality will be greater than -1.
0 does not satisfy this inequality because the LHS is not defined for x = 0 so it is immaterial.
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Save 100 on Veritas Prep GMAT Courses And Admissions Consulting Enroll now. Pay later. Take advantage of Veritas Prep's flexible payment plan options. Veritas Prep Reviews Intern Joined: 25 Jun 2011 Posts: 49 Location: Sydney Followers: 0 Kudos [?]: 1 [0], given: 7 Re: Inequality [#permalink] 10 Jul 2012, 15:40 Bunuel wrote: A. x<0 --> |x|=-x --> \frac{x}{-x}<x --> -1<x --> -1<x<0; Hi Bunuel, How did you derive -1<x<0 from -1<x without further calculation (quoting from your solution quoted above)? Thanks, Diana Manager Joined: 26 Dec 2011 Posts: 117 Followers: 1 Kudos [?]: 10 [0], given: 17 Re: Inequality [#permalink] 10 Jul 2012, 22:26 dianamao wrote: Bunuel wrote: A. x<0 --> |x|=-x --> \frac{x}{-x}<x --> -1<x --> -1<x<0; Hi Bunuel, How did you derive -1<x<0 from -1<x without further calculation (quoting from your solution quoted above)? Thanks, Diana Hi, It is -1<x and we got this for inequality when x<0, thus combining, -1<x<0..i hope its clear. Math Expert Joined: 02 Sep 2009 Posts: 25325 Followers: 3915 Kudos [?]: 35033 [0], given: 4063 Re: Inequality [#permalink] 11 Jul 2012, 00:44 Expert's post dianamao wrote: Bunuel wrote: A. x<0 --> |x|=-x --> \frac{x}{-x}<x --> -1<x --> -1<x<0; Hi Bunuel, How did you derive -1<x<0 from -1<x without further calculation (quoting from your solution quoted above)? Thanks, Diana For case A we consider range when x<0 and get that -1<x, so when we combine we get -1<x<0. _________________ Intern Joined: 25 Jun 2011 Posts: 49 Location: Sydney Followers: 0 Kudos [?]: 1 [0], given: 7 Re: If x/|x|<x which of the following must be true about x? [#permalink] 11 Jul 2012, 04:21 Awesome, Thank you! Director Joined: 22 Mar 2011 Posts: 612 WE: Science (Education) Followers: 76 Kudos [?]: 564 [0], given: 43 Re: If x/|x|<x which of the following must be true about x? [#permalink] 11 Jul 2012, 08:14 sanjoo wrote: VeritasPrepKarishma wrote: There was a lot of confusion between options (A) and (B). Therefore, I would like to explain why option (B) is correct using diagrams. Forget this question for a minute. Say instead you have this question: Question 1: x > 2 and x < 7. What integral values can x take? I guess most of you will come up with 3, 4, 5, 6. That’s correct. I can represent this on the number line. Attachment: Ques3.jpg You see that the overlapping area includes 3, 4, 5 and 6. Now consider this: Question 2: x > 2 or x > 5. What integral values can x take? Let’s draw that number line again. Attachment: Ques4.jpg So is the solution again the overlapping numbers i.e. all integers greater than 5? No. This question is different. x is greater than 2 OR greater than 5. This means that if x satisfies at least one of these conditions, it is included in your answer. Think of sets. AND means it should be in both the sets (i.e. overlapping). OR means it should be in at least one of the sets. Hence, which values can x take? All integral values starting from 3 onwards i.e. 3, 4, 5, 6, 7, 8, 9 … Now go back to this question. The solution is a one liner. If \frac{x}{|x|}<x which of the following must be true about x? (A) x>1 (B) x>-1 (C) |x|<1 (D) |x|=1 (E) |x|^2>1 \frac{x}{|x|} is either 1 or -1. So x > 1 or x > -1 So which values can x take? All values that are included in at least one of the sets. Therefore, x > -1. But wat if x will be zero?? that will be infinitive..!!.. I think answer a is correct.. m still confused . Stating that we must have x > -1, it doesn't mean that all the numbers with this property will satisfy the inequality given in the question. Also, the question is not asking for the set of solutions of the given inequality (which means all the values for which the inequality holds). It asks for a MUST or necessary condition. And we can easily see that another necessary condition, besides B, is x being non-zero. If we assume that x\leq -1, then we get \frac{x}{|x|}=\frac{x}{-x}=-1<x which contradicts x\leq -1. So, necessarily x must be greater than -1. Is this enough? Are there other conditions? Do all numbers greater than -1 satisfy the given inequality in the question? This is not what the question is about. But for sure, if x is not greater than -1, than the inequality cannot hold. Therefore, x MUST be greater than -1. _________________ PhD in Applied Mathematics Love GMAT Quant questions and running. Manager Joined: 27 May 2012 Posts: 213 Followers: 0 Kudos [?]: 48 [0], given: 245 Re: Inequality [#permalink] 31 Aug 2012, 00:23 Bunuel wrote: nmohindru wrote: If \frac{x}{|x|}<x which of the following must be true about x? (A) x>1 (B) x>-1 (C) |x|<1 (D) |x|=1 (E) |x|^2>1 This question was well explained by Durgesh and Ian Stewart, but since there are still some doubts, I'll try to add my 2 cents. First of all let's solve this inequality step by step and see what is the solution for it, or in other words let's see in which ranges this inequality holds true. Two cases for \frac{x}{|x|}<x: A. x<0 --> |x|=-x --> \frac{x}{-x}<x --> -1<x --> -1<x<0; B. x>0 --> |x|=x --> \frac{x}{x}<x --> 1<x. So given inequality holds true in the ranges: -1<x<0 and x>1. Which means that x can take values only from these ranges. ------{-1}xxxx{0}----{1}xxxxxx Now, we are asked which of the following must be true about x. Option A can not be ALWAYS true because x can be from the range -1<x<0, eg -\frac{1}{2} and x=-\frac{1}{2}<1. Only option which is ALWAYS true is B. ANY x from the ranges -1<x<0 and x>1 will definitely be more the -1, all "red", possible x-es are to the right of -1, which means that all possible x-es are more than -1. Answer: B. Bunuel just a small query here just to stick to a standard, its better not to divide by a variable as we don't know its sign, could be positive or negative so following that I did this sum , however was having difficulty at the end combining both the x ranges, please can you help \frac{x}{|x|} < x x<x|x| x-x|x|<0 x(1-|x|)<0 so first case when x>0 then 1-|x|<0 so 1-|x|<0 =|x|>1 |x| >1 = -1 > x > 1 so we have x>0and -1 > x > 1 now here is my concern how to combine these two to get the final range of x I am having difficulty combining these two to get x>1 , is there any technique ? second case ( although this was easier to combine ) x(1-|x|)<0 when x<0then 1-|x|>0 so 1-|x|>0 = 1 >|x| |x|<1 = -1< x < 1 we have x<0 and -1< x < 1 now again for combining these two is there any standard way? logically i can arrive at -1<x<0 _________________ - Stne Math Expert Joined: 02 Sep 2009 Posts: 25325 Followers: 3915 Kudos [?]: 35033 [0], given: 4063 Re: Inequality [#permalink] 31 Aug 2012, 00:40 Expert's post stne wrote: Bunuel wrote: nmohindru wrote: If \frac{x}{|x|}<x which of the following must be true about x? (A) x>1 (B) x>-1 (C) |x|<1 (D) |x|=1 (E) |x|^2>1 This question was well explained by Durgesh and Ian Stewart, but since there are still some doubts, I'll try to add my 2 cents. First of all let's solve this inequality step by step and see what is the solution for it, or in other words let's see in which ranges this inequality holds true. Two cases for \frac{x}{|x|}<x: A. x<0 --> |x|=-x --> \frac{x}{-x}<x --> -1<x --> -1<x<0; B. x>0 --> |x|=x --> \frac{x}{x}<x --> 1<x. So given inequality holds true in the ranges: -1<x<0 and x>1. Which means that x can take values only from these ranges. ------{-1}xxxx{0}----{1}xxxxxx Now, we are asked which of the following must be true about x. Option A can not be ALWAYS true because x can be from the range -1<x<0, eg -\frac{1}{2} and x=-\frac{1}{2}<1. Only option which is ALWAYS true is B. ANY x from the ranges -1<x<0 and x>1 will definitely be more the -1, all "red", possible x-es are to the right of -1, which means that all possible x-es are more than -1. Answer: B. Bunuel just a small query here just to stick to a standard, its better not to divide by a variable as we don't know its sign, could be positive or negative so following that I did this sum , however was having difficulty at the end combining both the x ranges, please can you help \frac{x}{|x|} < x x<x|x| x-x|x|<0 x(1-|x|)<0 so first case when x>0 then 1-|x|<0 so 1-|x|<0 =|x|>1 |x| >1 = -1 > x > 1 so we have x>0and -1 > x > 1 now here is my concern how to combine these two to get the final range of x I am having difficulty combining these two to get x>1 , is there any technique ? second case ( although this was easier to combine ) x(1-|x|)<0 when x<0 then 1-|x|>0 so 1-|x|>0 = 1 >|x| |x|<1 = -1< x < 1 we have x<0 and -1< x < 1 now again for combining these two is there any standard way? logically i can arrive at -1<x<0 When you consider x<0, then you automatically have that |x|=-x. Similarly, when you consider x>0, then you automatically have that |x|=x. x(1-|x|)<0: x<0 --> 1-(-x)>0 --> x>-1 --> -1<x<0. x>0 --> 1-x<0 --> x>1. So, the given inequality holds for -1<x<0. and x>1. Hope it's clear. _________________ Manager Joined: 26 Jul 2011 Posts: 131 Location: India WE: Marketing (Manufacturing) Followers: 1 Kudos [?]: 50 [0], given: 15 Re: If x/|x|<x which of the following must be true about x? [#permalink] 31 Aug 2012, 02:56 Nice!! question..It Tricks us between option A and B...I chose A in a haste when it should be B...nicely explained by Bunuel and @durgesh nice explanation for that thin line between "must be" and "always" true Senior Manager Joined: 16 Feb 2012 Posts: 259 Concentration: Finance, Economics Followers: 4 Kudos [?]: 92 [0], given: 121 Re: If x/|x|<x which of the following must be true about x? [#permalink] 31 Aug 2012, 03:11 Nice explanation by Bunuel. It's a lot clearer now. _________________ Kudos if you like the post! Failing to plan is planning to fail. Manager Joined: 27 May 2012 Posts: 213 Followers: 0 Kudos [?]: 48 [0], given: 245 Re: Inequality [#permalink] 31 Aug 2012, 14:06 nmohindru wrote: If \frac{x}{|x|}<x which of the following must be true about x? (A) x>1 (B) x>-1 (C) |x|<1 (D) |x|=1 (E) |x|^2>1 Bunuel wrote: This question was well explained by Durgesh and Ian Stewart, but since there are still some doubts, I'll try to add my 2 cents. First of all let's solve this inequality step by step and see what is the solution for it, or in other words let's see in which ranges this inequality holds true. Two cases for \frac{x}{|x|}<x: A. x<0 --> |x|=-x --> \frac{x}{-x}<x --> -1<x --> -1<x<0; B. x>0 --> |x|=x --> \frac{x}{x}<x --> 1<x. So given inequality holds true in the ranges: -1<x<0 and x>1. Which means that x can take values only from these ranges. ------{-1}xxxx{0}----{1}xxxxxx Now, we are asked which of the following must be true about x. Option A can not be ALWAYS true because x can be from the range -1<x<0, eg -\frac{1}{2} and x=-\frac{1}{2}<1. Only option which is ALWAYS true is B. ANY x from the ranges -1<x<0 and x>1 will definitely be more the -1, all "red", possible x-es are to the right of -1, which means that all possible x-es are more than -1. Answer: B. stne wrote: Bunuel just a small query here just to stick to a standard, its better not to divide by a variable as we don't know its sign, could be positive or negative so following that I did this sum , however was having difficulty at the end combining both the x ranges, please can you help \frac{x}{|x|} < x x<x|x| x-x|x|<0 x(1-|x|)<0 so first case when x>0 then 1-|x|<0 so 1-|x|<0 =|x|>1 |x| >1 = -1 > x > 1 so we have x>0and -1 > x > 1 now here is my concern how to combine these two to get the final range of x I am having difficulty combining these two to get x>1 , is there any technique ? second case ( although this was easier to combine ) x(1-|x|)<0 when x<0 then 1-|x|>0 so 1-|x|>0 = 1 >|x| |x|<1 = -1< x < 1 we have x<0 and -1< x < 1 now again for combining these two is there any standard way? logically i can arrive at -1<x<0 Bunuel wrote: When you consider x<0, then you automatically have that |x|=-x. Similarly, when you consider x>0, then you automatically have that |x|=x. x(1-|x|)<0: x<0 --> 1-(-x)>0 --> x>-1 --> -1<x<0. [align=]x>0 --> 1-x<0 --> x>1.[/align] So, the given inequality holds for -1<x<0. and x>1. Hope it's clear. Just got it Bunuel My silly query was how x>0 and x>1 translate to x>1 well I just imagined a number line and the region of overlap gave the combined equation -2 --- -1 ------0[---------1 ---2 --3----] (i) x>0 so for x>0 we have the region to the right of 0 , the area in green above for x >1 we have the area in purple below -2 ------ -1 ------0---------1 [---2 --3----] (ii) x>1 so the combined equation is the region of overlap of (i) and (ii) , as shown below -2 ------ -1 ------0--------- 1 [---2 --3----] combined x>1 hence x>0 and x>1 translates to x>1 similarly x<0 and -1< x <1, the region of overlap gives -1< x <0 silly me , _________________ - Stne Manager Joined: 12 Mar 2012 Posts: 171 Location: India Concentration: Technology, General Management GMAT Date: 07-23-2012 WE: Programming (Telecommunications) Followers: 0 Kudos [?]: 35 [0], given: 4 Re: If x/|x|<x which of the following must be true about x? [#permalink] 01 Sep 2012, 04:33 My learning: Since this Question is asking "must be true about x" so the answer should cover the whole range of x, even if there is a gap (in this case it is from 0 to 1) If the question would have asked "what all values of x satisfy this equation", then the correct answer would be "x > 1" (considering 0 < x < 1 is missing from choices) Am I correct!? _________________ FOCUS..this is all I need! Ku-Do! Veritas Prep GMAT Instructor Joined: 16 Oct 2010 Posts: 5150 Location: Pune, India Followers: 1249 Kudos [?]: 6053 [0], given: 172 Re: If x/|x|<x which of the following must be true about x? [#permalink] 02 Sep 2012, 21:02 Expert's post dexerash wrote: My learning: Since this Question is asking "must be true about x" so the answer should cover the whole range of x, even if there is a gap (in this case it is from 0 to 1) If the question would have asked "what all values of x satisfy this equation", then the correct answer would be "x > 1" (considering 0 < x < 1 is missing from choices) Am I correct!? Yes, you are correct that 'must be true about x' means the answer should cover the entire range of x. There can be some values in that range which x cannot take. Had the question asked for the 'all values of x that satisfy this equation', the correct answer would be -1 < x< 0 or x > 1. x can take the values from -1 to 0 too so it should also appear in the range. x>1 gives only the partial range of x. Check out this post for a detailed discussion on this question: http://www.veritasprep.com/blog/2012/07 ... -and-sets/ _________________ Karishma Veritas Prep | GMAT Instructor My Blog Save100 on Veritas Prep GMAT Courses And Admissions Consulting
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Re: If x/|x|<x which of the following must be true about x? [#permalink]  06 Dec 2012, 04:47
I read this technique posted here in GMATClub and it works without thinking much.

(1) Transform the equation to f(x) on one side and 0 on the other side.

x/|x| - x < 0
x(1/|x| - 1) < 0
x < 0 and |x| > 1

(2) Get check points
x < 0 ==> checkpoint: 0
|x| > 1 ==> checkpoints: 1 and -1

(3) Rearrange like this in the x-axis

+ (-1) - (0) + (1) -
<===(+)===(-1)===(-)===(0)===(+)===(1)===(-)===>

(4) Using the rule: if f(x) < 0, the values of x lie in the (-) regions
if f(x) > 0, the values of x lie in the (+) regions

(5) Answer: -1 < x < 0 and 1 < x

Thus: x is always greater than -1 ==> x> -1

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Re: If x/|x|<x which of the following must be true about x? [#permalink]  30 May 2013, 21:32
VeritasPrepKarishma wrote:
There was a lot of confusion between options (A) and (B). Therefore, I would like to explain why option (B) is correct using diagrams.

Forget this question for a minute. Say instead you have this question:

Question 1: x > 2 and x < 7. What integral values can x take?
I guess most of you will come up with 3, 4, 5, 6. That’s correct. I can represent this on the number line.
Attachment:
Ques3.jpg

You see that the overlapping area includes 3, 4, 5 and 6.

Now consider this:

Question 2: x > 2 or x > 5. What integral values can x take?
Let’s draw that number line again.
Attachment:
Ques4.jpg

So is the solution again the overlapping numbers i.e. all integers greater than 5? No. This question is different. x is greater than 2 OR greater than 5. This means that if x satisfies at least one of these conditions, it is included in your answer. Think of sets. AND means it should be in both the sets (i.e. overlapping). OR means it should be in at least one of the sets. Hence, which values can x take? All integral values starting from 3 onwards i.e. 3, 4, 5, 6, 7, 8, 9 …

Now go back to this question. The solution is a one liner.

If \frac{x}{|x|}<x which of the following must be true about x?
(A) x>1
(B) x>-1
(C) |x|<1
(D) |x|=1
(E) |x|^2>1

\frac{x}{|x|} is either 1 or -1.
So x > 1 or x > -1
So which values can x take? All values that are included in at least one of the sets. Therefore, x > -1.

Hi Karishma/Bunnel,

Had the question been 'Which of the values of x satisfies this inequality?' then the correct answer would have been A

Now the question is essentially, 'Which of the following ranges consists of all values of x that satisfy this inequality?'

Please correct me if i am wrong.
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Re: If x/|x|<x which of the following must be true about x? [#permalink]  31 May 2013, 01:52
Expert's post
cumulonimbus wrote:
VeritasPrepKarishma wrote:
There was a lot of confusion between options (A) and (B). Therefore, I would like to explain why option (B) is correct using diagrams.

Forget this question for a minute. Say instead you have this question:

Question 1: x > 2 and x < 7. What integral values can x take?
I guess most of you will come up with 3, 4, 5, 6. That’s correct. I can represent this on the number line.
Attachment:
Ques3.jpg

You see that the overlapping area includes 3, 4, 5 and 6.

Now consider this:

Question 2: x > 2 or x > 5. What integral values can x take?
Let’s draw that number line again.
Attachment:
Ques4.jpg

So is the solution again the overlapping numbers i.e. all integers greater than 5? No. This question is different. x is greater than 2 OR greater than 5. This means that if x satisfies at least one of these conditions, it is included in your answer. Think of sets. AND means it should be in both the sets (i.e. overlapping). OR means it should be in at least one of the sets. Hence, which values can x take? All integral values starting from 3 onwards i.e. 3, 4, 5, 6, 7, 8, 9 …

Now go back to this question. The solution is a one liner.

If \frac{x}{|x|}<x which of the following must be true about x?
(A) x>1
(B) x>-1
(C) |x|<1
(D) |x|=1
(E) |x|^2>1

\frac{x}{|x|} is either 1 or -1.
So x > 1 or x > -1
So which values can x take? All values that are included in at least one of the sets. Therefore, x > -1.

Hi Karishma/Bunnel,

Had the question been 'Which of the values of x satisfies this inequality?' then the correct answer would have been A

Now the question is essentially, 'Which of the following ranges consists of all values of x that satisfy this inequality?'

Please correct me if i am wrong.

Yes, that's correct.
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Re: Inequality [#permalink]  31 May 2013, 03:25
[quote="sandeeepsharma"]as bunnel said:
X>-1 will always hold condition true.

If i take value as 0.5 which is greater then -1

.5/|.5|=1 which is not less then 1

for me -1<x<0 and x>1 both holds true.

You are absolutely right, thats why answer is X>-1, if you chose your answer x>1 then you are missing a subset i.e. -1<x<0.

X must be greater than -1 in all cases.
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Re: If x/|x|<x which of the following must be true about x? [#permalink]  09 Jul 2013, 21:34
If x/|x|<x which of the following must be true about x?

This can be solved by plugging in numbers from each of the five answer choices:

(A) x>1
x/|x|<x
2/|2| < 2
1<2 Valid - this is a possible answer choice

(B) x>-1
x/|x|<x
-0.5/|-0.5|<-0.5
-1<-0.5 Valid - this is a possible answer choice

(C) |x|<1
-1<x<1
x/|x|<x
0/|0|<0
0<0 Invalid - 0 is not less than 0

(D) |x|=1
x=1, x=-1
x/|x|<x
1/|1|<1
1<1 Invalid as 1 is not less than 1

(E) |x|^2>1
x>1, x<-1
x/|x|<x
-2/|-2|<-2
-1< -2 Invalid as -1 is GREATER than -2

While (a) is correct, (b) is the right answer as it includes valid possibilities that are not included in (a)

(B)

Also, solving algebraically: x/|x|<x
Two cases:
x>0
x/|x|<x
x/x<x
1<x
(If x>0 and x>1 then the intersection is at x>1 because only x>1 contains all cases that x>0 does)
x<0
x/|x|<x
x/(-x)<x
-1<x
-1<x<0

So: -1<x<0 AND 1<x
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Re: If x/|x|<x which of the following must be true about x? [#permalink]  16 Feb 2014, 12:14
x cannot be zero and x cannot take values between 0<x<1 eg. lets try 1/2 in the equation
1/2/|1/2|<1/2
1<1/2 not possible
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Re: If x/|x|<x which of the following must be true about x? [#permalink]  16 Feb 2014, 19:28
Expert's post
khannitw5 wrote:
x cannot be zero and x cannot take values between 0<x<1 eg. lets try 1/2 in the equation
1/2/|1/2|<1/2
1<1/2 not possible

That's not correct. Check the explanations given above or this post: http://www.veritasprep.com/blog/2012/07 ... -and-sets/
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Re: If x/|x|<x which of the following must be true about x?   [#permalink] 16 Feb 2014, 19:28

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