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

It is currently 01 Oct 2014, 04:24

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

For Integers A and B, if SQRT(A^3 - A^2 -B) = 7, what is the

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Senior Manager
Senior Manager
avatar
Joined: 19 May 2004
Posts: 291
Followers: 1

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

For Integers A and B, if SQRT(A^3 - A^2 -B) = 7, what is the [#permalink] New post 15 Nov 2004, 12:10
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 100% (01:23) wrong based on 1 sessions
For Integers A and B, if SQRT(A^3 - A^2 -B) = 7, what is the value of A?

1. A^2 - A = 12
2. B^2 - B = 2
Director
Director
User avatar
Joined: 07 Nov 2004
Posts: 697
Followers: 4

Kudos [?]: 16 [0], given: 0

 [#permalink] New post 15 Nov 2004, 12:28
I pick C as well.

S(1) gives a = 4 , -3 insufficient
S(2) gives b= 2, -1 insufficient

but using 1 & 2 we can solve for a.
Senior Manager
Senior Manager
User avatar
Joined: 19 Oct 2004
Posts: 320
Location: Missouri, USA
Followers: 1

Kudos [?]: 7 [0], given: 0

 [#permalink] New post 15 Nov 2004, 13:21
Im getting C..

Statement 1-

a^3-a^2-b=49
12a-b=49-------- insuff.

statement 2-

after all the simplification i get a^3-a^2-b^2=47 .... insuff.

combining both,

(b+1)(b-2)=0

b=-1 or 2
substituting for a in statement 1, a= 4 or 17/4. we can leave out the last value, since a= integer.
_________________

Let's get it right!!!!

Manager
Manager
avatar
Joined: 09 Sep 2004
Posts: 166
Followers: 1

Kudos [?]: 1 [0], given: 0

 [#permalink] New post 15 Nov 2004, 13:27
I do not understand. Could some one explain this in itsy bitsy bits! :stupid2

Ta very mcuh!
Director
Director
User avatar
Joined: 31 Aug 2004
Posts: 609
Followers: 3

Kudos [?]: 22 [0], given: 0

 [#permalink] New post 15 Nov 2004, 13:38
I would choose B.

Statement 1 is unuseful : A = 4 or -3

Statement 2 : B = 2 or -1

we know from the stem that sqrt(A^3-A^2-B)=7 => A^3-A^2=48 or 51
A being an integer only A=4 matches with 48
Senior Manager
Senior Manager
avatar
Joined: 19 May 2004
Posts: 291
Followers: 1

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

 [#permalink] New post 15 Nov 2004, 13:47
twixt,
You got it :)

It's B.
I find it a very difficult question.
I wonder, How long did it take you to solve this one ?
Director
Director
User avatar
Joined: 31 Aug 2004
Posts: 609
Followers: 3

Kudos [?]: 22 [0], given: 0

 [#permalink] New post 15 Nov 2004, 14:15
Keep posting this kind of hard DS Dookie this is good brainstorm material !

By the way where are they from ?

This one took me 12 lines on a scratch paper, 3 minutes I guess. I was suspicious as I had a really similar one during the real test and I always try to be cautious when dealing with integers and well rounded results :o
Director
Director
User avatar
Joined: 07 Nov 2004
Posts: 697
Followers: 4

Kudos [?]: 16 [0], given: 0

 [#permalink] New post 15 Nov 2004, 18:11
Wow! never thought about that :oops:

thanks twixt for the solution and Dookie for posting this problem!
  [#permalink] 15 Nov 2004, 18:11
    Similar topics Author Replies Last post
Similar
Topics:
19 Experts publish their posts in the topic For integers a and b, if (a^3 a^2 b)^1/2 = 7, what is the aalriy 12 08 Dec 2010, 08:39
For integers, a and b, if sqrt ( a^3 - a^2 - b) = 7, what is anandsebastin 6 24 Oct 2006, 12:53
For integers a and b, if square root of (a^3 - a^2 - b) = 7, rahulraao 16 22 Oct 2005, 21:22
For integers a and b, if sqrt(a^3 - a^2 - b) = 7, what is tyagel 3 22 Oct 2004, 12:23
For integers, a and b, if sqrt(a^3 - a^2 - b) = 7, what is hardworker_indian 12 05 Oct 2004, 17:52
Display posts from previous: Sort by

For Integers A and B, if SQRT(A^3 - A^2 -B) = 7, what is the

  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®.