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

It is currently 22 Sep 2014, 10:27

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

(165)^2 - (164)^2 =

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Manager
Manager
avatar
Joined: 06 Aug 2011
Posts: 60
Concentration: Entrepreneurship, Finance
GPA: 3.87
Followers: 0

Kudos [?]: 4 [0], given: 1

(165)^2 - (164)^2 = [#permalink] New post 10 Mar 2012, 22:53
4
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

82% (01:36) correct 18% (01:10) wrong based on 123 sessions
(165)^2 - (164)^2 =

A. 1
B. 100
C. 229
D. 329
E. 349
[Reveal] Spoiler: OA
1 KUDOS received
SVP
SVP
avatar
Joined: 16 Nov 2010
Posts: 1691
Location: United States (IN)
Concentration: Strategy, Technology
Followers: 30

Kudos [?]: 290 [1] , given: 36

GMAT Tests User Premium Member Reviews Badge
Re: Subtracting Squared Numbers [#permalink] New post 10 Mar 2012, 22:55
1
This post received
KUDOS
CLearly :

a^2 - b^2 = (a+b) * (a-b)

=> (165)^2 - (164)^2 = (165 + 164) * (165 - 164) = 329 * 1

Answer - D
_________________

Formula of Life -> Achievement/Potential = k * Happiness (where k is a constant)

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Manager
Manager
avatar
Joined: 06 Aug 2011
Posts: 60
Concentration: Entrepreneurship, Finance
GPA: 3.87
Followers: 0

Kudos [?]: 4 [0], given: 1

Re: (165)^2 - (164)^2 = [#permalink] New post 10 Mar 2012, 23:07
Thanks!

... But what would you do if the problem were written more like this:

(165)^3 - (163)^3 =

or:

(165)^2 - (163)^3 =
SVP
SVP
avatar
Joined: 16 Nov 2010
Posts: 1691
Location: United States (IN)
Concentration: Strategy, Technology
Followers: 30

Kudos [?]: 290 [0], given: 36

GMAT Tests User Premium Member Reviews Badge
Re: (165)^2 - (164)^2 = [#permalink] New post 10 Mar 2012, 23:15
(165)^3 - (163)^3

You can use the formula a^3 - b^3

(165)^2 - (163)^3

Expand (163)^3 as (165 - 2)^3 to simplify further.
_________________

Formula of Life -> Achievement/Potential = k * Happiness (where k is a constant)

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Manager
Manager
avatar
Joined: 06 Aug 2011
Posts: 60
Concentration: Entrepreneurship, Finance
GPA: 3.87
Followers: 0

Kudos [?]: 4 [0], given: 1

Re: (165)^2 - (164)^2 = [#permalink] New post 10 Mar 2012, 23:24
I think I'll have to go to YouTube or something for the ^2 x ^3, but I think I get the ^3 x ^3:

(165)^2 - (164)^2 = (165)^3 - (164)^3 = 329
Manager
Manager
avatar
Status: And the Prep starts again...
Joined: 03 Aug 2010
Posts: 138
Followers: 1

Kudos [?]: 24 [0], given: 20

GMAT Tests User
Re: (165)^2 - (164)^2 = [#permalink] New post 16 Apr 2012, 06:10
Stoneface wrote:
(165)^2 - (164)^2 =

A. 1
B. 100
C. 229
D. 329
E. 349


Difference between square of two consecutive numbers is = the sum of the of the two consecutive numbers

165+164 = 329

D
_________________

My First Blog on my GMAT Journey

Arise, Awake and Stop not till the goal is reached

Director
Director
User avatar
Status: The Best Or Nothing
Joined: 27 Dec 2012
Posts: 930
Location: India
Concentration: General Management, Technology
WE: Information Technology (Computer Software)
Followers: 6

Kudos [?]: 239 [0], given: 167

Re: (165)^2 - (164)^2 = [#permalink] New post 27 Feb 2014, 20:32
Stoneface wrote:
(165)^2 - (164)^2 =

A. 1
B. 100
C. 229
D. 329
E. 349



Using the formula:

(a+1)^2 - a^2 = 2a+1

So, Answer = 164*2 + 1
= 328+1 = 329 = Answer = D
_________________

Kindly press "+1 Kudos" to appreciate :)

Intern
Intern
avatar
Joined: 17 Aug 2014
Posts: 6
Followers: 0

Kudos [?]: 0 [0], given: 11

Re: (165)^2 - (164)^2 = [#permalink] New post 28 Aug 2014, 15:37
Where can these rules for this particular problem be found?
Intern
Intern
avatar
Joined: 27 Aug 2014
Posts: 28
GMAT Date: 09-27-2014
Followers: 1

Kudos [?]: 3 [0], given: 25

CAT Tests
Re: (165)^2 - (164)^2 = [#permalink] New post 28 Aug 2014, 21:30
GMATcrusher wrote:
Where can these rules for this particular problem be found?


See Bunuel's signature for the Math exponents resources link.
Intern
Intern
avatar
Joined: 27 Aug 2014
Posts: 28
GMAT Date: 09-27-2014
Followers: 1

Kudos [?]: 3 [0], given: 25

CAT Tests
Re: (165)^2 - (164)^2 = [#permalink] New post 28 Aug 2014, 21:34
Stoneface wrote:
I think I'll have to go to YouTube or something for the ^2 x ^3, but I think I get the ^3 x ^3:

(165)^2 - (164)^2 = (165)^3 - (164)^3 = 329


No, the expansion is different for both, please see the exponents theory in the Math chapter resources section.

(165)^2 - (164)^2 = 329

(165)^3 - (164)^3 = 81181
Expert Post
1 KUDOS received
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 23509
Followers: 3515

Kudos [?]: 26672 [1] , given: 2714

Re: (165)^2 - (164)^2 = [#permalink] New post 29 Aug 2014, 04:11
1
This post received
KUDOS
Expert's post
GMATcrusher wrote:
Where can these rules for this particular problem be found?


Check Tips and hints on Algebra here: algebra-tips-and-hints-175003.html

Also, I suggest you to go through the following post ALL YOU NEED FOR QUANT and check links in my signature below.

Hope it helps.
_________________

NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
25 extra-hard Quant Tests

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Re: (165)^2 - (164)^2 =   [#permalink] 29 Aug 2014, 04:11
    Similar topics Author Replies Last post
Similar
Topics:
Jan Micker s 1652 masterwork Bird s Eye View of Amsterdam, ankit0411 11 02 Oct 2012, 22:53
Display posts from previous: Sort by

(165)^2 - (164)^2 =

  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®.