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

 It is currently 31 Aug 2016, 20:55

### 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

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Is x^2 > 15? (1) x > -4 (2) x^3 < 0

Author Message
TAGS:

### Hide Tags

Moderator
Joined: 01 Sep 2010
Posts: 2994
Followers: 717

Kudos [?]: 5779 [1] , given: 971

Is x^2 > 15? (1) x > -4 (2) x^3 < 0 [#permalink]

### Show Tags

22 May 2012, 14:51
1
KUDOS
3
This post was
BOOKMARKED
00:00

Difficulty:

55% (hard)

Question Stats:

46% (01:58) correct 54% (00:38) wrong based on 54 sessions

### HideShow timer Statistics

Is x^2 > 15?

(1) x > -4
(2) x^3 < 0
[Reveal] Spoiler: OA

_________________
Math Expert
Joined: 02 Sep 2009
Posts: 34527
Followers: 6314

Kudos [?]: 80123 [1] , given: 10027

Re: Is x^2 > 15? (1) x > -4 (2) x^3 < 0 [#permalink]

### Show Tags

22 May 2012, 15:04
1
KUDOS
Expert's post
1
This post was
BOOKMARKED
Is x^2 > 15?

Is $$x^2>15$$? --> is $$x<-\sqrt{15}$$ or is $$x>\sqrt{15}$$?

(1) x > -4 --> if $$-4<x<-\sqrt{15}$$ or if $$x>\sqrt{15}$$ then the answer is YES but if $$-\sqrt{15}\leq{x}\leq{\sqrt{15}}$$ then the answer is NO. Not sufficient.

(2) x^3 < 0 --> $$x<0$$ --> if $$x<-\sqrt{15}$$ then the answer is YES but if $$-\sqrt{15}\leq{x}<0$$ then the answer is NO. Not sufficient.

(1)+(2) $$x>-4$$ and $$x<0$$ --> $$-4<x<0$$ --> if $$-4<x<-\sqrt{15}$$ then the answer is YES but if $$-\sqrt{15}\leq{x}<0$$ then the answer is NO. Not sufficient.

Hope it's clear.
_________________
Moderator
Joined: 01 Sep 2010
Posts: 2994
Followers: 717

Kudos [?]: 5779 [0], given: 971

Re: Is x^2 > 15? (1) x > -4 (2) x^3 < 0 [#permalink]

### Show Tags

22 May 2012, 15:41
maybe is a bit comfortable to work with number on a number line instead of $$\sqrt{15}$$ (is the same after all)

1) x > - 4 -----> -3,9 is largest than 15 but -3 NO but again +5 yes insuff

2) x^3 < 0 ---> x is negative -----> -1 is NO -5 is YES Insuff

1) + 2) we have only negative value but -1 is YES -3.9 is NO -----> E

Thanks Bunuel .
_________________
GMAT Club Legend
Joined: 09 Sep 2013
Posts: 11188
Followers: 512

Kudos [?]: 134 [0], given: 0

Re: Is x^2 > 15? (1) x > -4 (2) x^3 < 0 [#permalink]

### Show Tags

24 Jun 2015, 05:01
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
Re: Is x^2 > 15? (1) x > -4 (2) x^3 < 0   [#permalink] 24 Jun 2015, 05:01
Similar topics Replies Last post
Similar
Topics:
Is x > 0? (1) x^2 < 9 (2) x^3 < -8 2 21 Mar 2016, 07:41
4 Is 1+x+x^2+x^3+x^4<1/(1-x)? 1) x>0 2) x<1 * A solution will be post 6 21 Mar 2016, 04:31
1 Is (x - 4)(x - 3)(x + 2)(x + 1) > 0 ? (1) 3 > x (2) x > -1 5 28 Jul 2015, 01:46
7 Is (x - 4)(x - 3)(x + 2)(x + 1) > 0 5 27 Sep 2013, 08:01
10 Is x^3 > x^2? (1) x > 0 (2) x^2 > x 13 22 Sep 2011, 01:18
Display posts from previous: Sort by

# Is x^2 > 15? (1) x > -4 (2) x^3 < 0

 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®.