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

 It is currently 21 Aug 2014, 18:06

### 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

# Math : Algebra 101

Author Message
TAGS:
VP
Status: Final Lap Up!!!
Affiliations: NYK Line
Joined: 21 Sep 2012
Posts: 1096
Location: India
GMAT 1: 410 Q35 V11
GMAT 2: 530 Q44 V20
GMAT 3: 630 Q45 V31
GPA: 3.84
WE: Engineering (Transportation)
Followers: 32

Kudos [?]: 247 [0], given: 67

Re: Math : Algebra 101 [#permalink]  29 Jan 2013, 05:47
VeritasPrepKarishma wrote:
Archit143 wrote:
Need Help!!! Urgent

What is the difference between the solution of below problems, Is there any difference in the approach:-
1. X^3 > X

soln: -1<X<0 or X>1

If we follow the above principle for solving than the answer to below equation must be:

2. a^3< a^2 + 2a

-1<a<0 or a>2

but the answer as per MGMAt quant book is
0<a<2 or a<-1

Pls help me in getting the right concept.........

Responding to a pm:

2. a^3< a^2 + 2a

a^3 - a^2 - 2a < 0
a(a - 2)(a + 1) < 0

......-1.....0............2.......

Since you want the expression to be negative, the required range is a < -1 or 0 < a < 2 (Notice the sign in the original inequality. It is less than)

The range you have written: -1<a<0 or a>2 is for the expression to be positive.

Check out these posts for further clarification:

http://www.veritasprep.com/blog/2012/06 ... e-factors/
http://www.veritasprep.com/blog/2012/07 ... ns-part-i/
http://www.veritasprep.com/blog/2012/07 ... s-part-ii/
http://www.veritasprep.com/blog/2012/07 ... qualities/

Karishma

You are no less than Ron ...I would rate you above them in Maths
I mean what great explanations.......
can you fw the links of your blog on MODULUS, various type of questions.....
Thanks a trillion....I am sure i have added atleast 1 point to my maths score.......

Was it so simple!!!!!!!!I am thinking now!!!!!!!!!!!!!!!!!!!!

Archit
 Manhattan GMAT Discount Codes Kaplan GMAT Prep Discount Codes GMAT Pill GMAT Discount Codes
Math Expert
Joined: 02 Sep 2009
Posts: 19041
Followers: 3363

Kudos [?]: 24474 [0], given: 2680

Re: Math : Algebra 101 [#permalink]  10 Jul 2013, 23:06
Expert's post
Bumping for review*.

*New project from GMAT Club!!! Check HERE

_________________
Intern
Joined: 02 Apr 2012
Posts: 3
Followers: 0

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

Re: Math : Algebra 101 [#permalink]  23 Oct 2013, 06:17
Thank you for the book, it is a very useful one. I have a question on Solving equations of degree 2 : QUADRATIC part.
"The sum is -11 and the product is 30. So numbers are -5,-6". I think there is a typo: the sum is 11 (=b), not -11 as far as the solutions are x1=-5, and x2=-6 (we have 2 binomials (x+5) and (x+6). Please correct if I am wrong.
Thanks again.
Math Expert
Joined: 02 Sep 2009
Posts: 19041
Followers: 3363

Kudos [?]: 24474 [0], given: 2680

Re: Math : Algebra 101 [#permalink]  24 Oct 2013, 01:26
Expert's post
marvas wrote:
Thank you for the book, it is a very useful one. I have a question on Solving equations of degree 2 : QUADRATIC part.
"The sum is -11 and the product is 30. So numbers are -5,-6". I think there is a typo: the sum is 11 (=b), not -11 as far as the solutions are x1=-5, and x2=-6 (we have 2 binomials (x+5) and (x+6). Please correct if I am wrong.
Thanks again.

The sum of the roots is (-5) + (-6) = -11, which is -b/a=-(11/1)=-11.

Hope it's clear.
_________________
Re: Math : Algebra 101   [#permalink] 24 Oct 2013, 01:26
Similar topics Replies Last post
Similar
Topics:
algebra 2 07 Oct 2009, 20:01
Algebra 2 27 Apr 2009, 18:27
Algebra 3 25 Mar 2009, 22:04
Algebra ! 10 17 Jan 2006, 02:57
Display posts from previous: Sort by