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

It is currently 28 Jul 2015, 02:34
GMAT Club Tests

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 a,b,c,d and x are all non zero integers, is the product

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Intern
Intern
avatar
Joined: 16 Apr 2007
Posts: 26
Followers: 0

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

If a,b,c,d and x are all non zero integers, is the product [#permalink] New post 11 Oct 2007, 22:56
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

If a,b,c,d and x are all non zero integers, is the product ax*(bx)^2*(cx)^3*(dx)^4 positive or negative?
(1) a < c < x < 0
(2) b < d < x < 0
Director
Director
avatar
Joined: 11 Jun 2007
Posts: 932
Followers: 1

Kudos [?]: 83 [0], given: 0

Re: DS [#permalink] New post 11 Oct 2007, 23:06
mohansb wrote:
If a,b,c,d and x are all non zero integers, is the product ax*(bx)^2*(cx)^3*(dx)^4 positive or negative?
(1) a < c < x < 0
(2) b < d < x < 0


i get A

we just need to know the signs for a, c, and x because regardless of what b and d are, their expressions will always be positive since they are raised to an even power

stmt 1 clearly tells us that a, c, and x are all negative
so the expression ax*(bx)^2*(cx)^3*(dx)^4 ends up positive
suff

stmt 2 only tells us that x is neg
not suff

Last edited by beckee529 on 11 Oct 2007, 23:08, edited 1 time in total.
SVP
SVP
User avatar
Joined: 01 May 2006
Posts: 1798
Followers: 9

Kudos [?]: 106 [0], given: 0

 [#permalink] New post 12 Oct 2007, 01:14
(A) too for me :)

Sign(ax*(bx)^2*(cx)^3*(dx)^4) = Sign(a*x) * Sign(c*x) as (bx)^2 > 0 and (dx)^4 > 0

So, we have to know the sign of a*x and of b*x. Let see the statments now :)

Stat 1
a < c < x < 0

Implies that:
o a*x > 0
o c*x > 0

SUFF.

Stat 2
b < d < x < 0

Nothing about a and nothing about c.

INSUFF.
Intern
Intern
User avatar
Joined: 09 Oct 2007
Posts: 17
Followers: 0

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

Re: DS [#permalink] New post 12 Oct 2007, 01:43
mohansb wrote:
If a,b,c,d and x are all non zero integers, is the product ax*(bx)^2*(cx)^3*(dx)^4 positive or negative?
(1) a < c < x < 0
(2) b < d < x < 0


Agree, it is A. We should examine only those products that may be positive or negative. Those with powers 2 and 4 may be neglected.
Re: DS   [#permalink] 12 Oct 2007, 01:43
Display posts from previous: Sort by

If a,b,c,d and x are all non zero integers, is the product

  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®.