Find all School-related info fast with the new School-Specific MBA Forum

It is currently 10 Jul 2014, 20:42

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

If x > 0, then 1/ = 1/sqrt3x 1/ 1/(xsqrt2)

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Manager
Manager
avatar
Joined: 10 Oct 2005
Posts: 63
Followers: 1

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

If x > 0, then 1/ = 1/sqrt3x 1/ 1/(xsqrt2) [#permalink] New post 18 Oct 2005, 19:24
If x > 0, then 1/[sqrt(2x)+sqrt(x)]=

1/sqrt3x

1/[2sqrt(2x)]

1/(xsqrt2)

(sqrt2-1)/sqrtx

(1+2)/sqrtx
Director
Director
User avatar
Joined: 14 Oct 2003
Posts: 592
Location: On Vacation at My Crawford, Texas Ranch
Followers: 1

Kudos [?]: 4 [0], given: 0

GMAT Tests User
Re: p/s sqrt [#permalink] New post 18 Oct 2005, 19:28
trickygmat wrote:
If x > 0, then 1/sqrt(2x)+sqrtx=

1/sqrt3x

1/[2sqrt(2x)]

1/(xsqrt2)

(sqrt2-1)/sqrtx

(1+2)/sqrtx


your parentheses are ambiguous :!:
Director
Director
avatar
Joined: 21 Aug 2005
Posts: 795
Followers: 2

Kudos [?]: 5 [0], given: 0

GMAT Tests User
 [#permalink] New post 18 Oct 2005, 19:28
D (sqrt2-1)/sqrtx

(1/sq(2x)+sq(x))*([sq(2x)-sq(x)]/[sq(2x)+sq(x)])
= [sq(2x)-sq(x)]/x = sq(x)*[sq(2)-1]/x = [sq(2)-1]/sq(x)
Director
Director
User avatar
Joined: 14 Oct 2003
Posts: 592
Location: On Vacation at My Crawford, Texas Ranch
Followers: 1

Kudos [?]: 4 [0], given: 0

GMAT Tests User
 [#permalink] New post 18 Oct 2005, 20:18
gsr wrote:
D (sqrt2-1)/sqrtx

(1/sq(2x)+sq(x))*([sq(2x)-sq(x)]/[sq(2x)+sq(x)])
= [sq(2x)-sq(x)]/x = sq(x)*[sq(2)-1]/x = [sq(2)-1]/sq(x)


can you mutiply by

(sq(2x) - sq(x))
(sq(2x) +sq(x)) ?

how do you get from

sq(x)[sq(2) - 1] -------> [sq(2)-1]
--------- X ------------------- Sq(X)


Just asking...
Director
Director
avatar
Joined: 21 Aug 2005
Posts: 795
Followers: 2

Kudos [?]: 5 [0], given: 0

GMAT Tests User
 [#permalink] New post 18 Oct 2005, 20:23
Titleist wrote:
gsr wrote:
D (sqrt2-1)/sqrtx

(1/sq(2x)+sq(x))*([sq(2x)-sq(x)]/[sq(2x)+sq(x)])
= [sq(2x)-sq(x)]/x = sq(x)*[sq(2)-1]/x = [sq(2)-1]/sq(x)


can you mutiply by

(sq(2x) - sq(x))
(sq(2x) +sq(x)) ?

how do you get from

sq(x)[sq(2) - 1] -------> [sq(2)-1]
--------- X ------------------- Sq(X)

Just asking...


sorry typo...multiply Numerator and Den. by sqrt(2x)-sqrtx

on the other one -

sq(x)*[sq(2)-1]/x = sq(x)*[sq(2)-1]/[sq(x)*sq(x)]

= [sq(2)-1]/sq(x)
Director
Director
User avatar
Joined: 14 Oct 2003
Posts: 592
Location: On Vacation at My Crawford, Texas Ranch
Followers: 1

Kudos [?]: 4 [0], given: 0

GMAT Tests User
 [#permalink] New post 18 Oct 2005, 20:28
gsr wrote:
Titleist wrote:
gsr wrote:
D (sqrt2-1)/sqrtx

(1/sq(2x)+sq(x))*([sq(2x)-sq(x)]/[sq(2x)+sq(x)])
= [sq(2x)-sq(x)]/x = sq(x)*[sq(2)-1]/x = [sq(2)-1]/sq(x)


can you mutiply by

(sq(2x) - sq(x))
(sq(2x) +sq(x)) ?

how do you get from

sq(x)[sq(2) - 1] -------> [sq(2)-1]
--------- X ------------------- Sq(X)

Just asking...


sorry typo...multiply Numerator and Den. by sqrt(2x)-sqrtx

on the other one -

sq(x)*[sq(2)-1]/x = sq(x)*[sq(2)-1]/[sq(x)*sq(x)]

= [sq(2)-1]/sq(x)


ahhh yes. this can mean only two things; i'm getting tired and my new avatar is distracting the hell out of me. i'm going to bed goodnight all! see you tomorrow. :sleep:
Manager
Manager
User avatar
Joined: 03 Aug 2005
Posts: 134
Followers: 1

Kudos [?]: 2 [0], given: 0

 [#permalink] New post 19 Oct 2005, 03:47
Finally I got it!!! This question was driving me crazy.

There is another typo:

Stem is 1/(sq(2x)+sq(x)) not (1/sq(2x)+sq(x)),
GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jul 2004
Posts: 5097
Location: Singapore
Followers: 16

Kudos [?]: 130 [0], given: 0

GMAT Tests User
 [#permalink] New post 19 Oct 2005, 04:51
I have edited the question for trickygmat so the parentheses are correctly placed.

By the way, D is my answer as well. Same method as the rest.
VP
VP
User avatar
Joined: 20 Sep 2005
Posts: 1023
Followers: 3

Kudos [?]: 24 [0], given: 0

GMAT Tests User
 [#permalink] New post 19 Oct 2005, 15:47
1/[sqrt(2x)+sqrt(x)]= 1/ ( (sqrt(2) + 1)sqrt(x) ) .

Since (sqrt(2) -1 )(sqrt(2) + 1 ) = 2 - 1 = 1. Put that in the numerator and we get (sqrt(2) -1 )/sqrt(x).

All this sqrt text intead of the symbol makes typing miserable :).
  [#permalink] 19 Oct 2005, 15:47
    Similar topics Author Replies Last post
Similar
Topics:
Is x=0 (1) x+1>0 (2) x= -x linau1982 3 23 Oct 2008, 14:45
Is X>3? 1) (x-3)(x-2)(x-1)>0 2) x>1 GK_Gmat 4 04 Jul 2007, 00:30
If x > 0, then 1/ = A. 1/sqrt(3x) B. 1/ C. 1/(xsqrt(2)) joemama142000 9 06 Feb 2006, 21:32
If X>0, K=0.1-(0.1)^2, is X>0.05? (1)K>0.0009/X laxieqv 18 28 Dec 2005, 19:42
Is X > 3? 1) (X - 3)*(X - 2)*(X - 1) > 0 2) X > 1 Titleist 5 24 Oct 2005, 15:39
Display posts from previous: Sort by

If x > 0, then 1/ = 1/sqrt3x 1/ 1/(xsqrt2)

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.