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

It is currently 01 Sep 2015, 14:44
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

Which of the following is equal to the average (arithmetic

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Intern
Intern
avatar
Joined: 27 Feb 2012
Posts: 37
Followers: 1

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

Which of the following is equal to the average (arithmetic [#permalink] New post 16 Jun 2012, 19:42
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

85% (01:30) correct 15% (00:40) wrong based on 54 sessions
Which of the following is equal to the average (arithmetic mean) of (x+2)^2 and (x-2)^2?

A. x^2
B. x^2+2
C. x^2 +4
D. x^2+2x
E. x^2+4x
[Reveal] Spoiler: OA
Intern
Intern
User avatar
Joined: 03 Jun 2012
Posts: 32
Location: United States
WE: Project Management (Computer Software)
Followers: 0

Kudos [?]: 22 [0], given: 2

Re: which of the following is equal avg (x+2)^2 and (x-2)^2 [#permalink] New post 16 Jun 2012, 20:42
Answer C.

Avg = [(x+2)^2 + (x-2)^2] / 2

Expanding and simplifying, (x^2 + 4x + 4 + x^2 - 4x + 4 ) / 2 = x^2 + 4
Senior Manager
Senior Manager
User avatar
Joined: 28 Mar 2012
Posts: 287
Concentration: Entrepreneurship
GMAT 1: 640 Q50 V26
GMAT 2: 660 Q50 V28
GMAT 3: 730 Q50 V38
Followers: 21

Kudos [?]: 242 [0], given: 23

GMAT ToolKit User
Re: which of the following is equal avg (x+2)^2 and (x-2)^2 [#permalink] New post 16 Jun 2012, 20:55
jsphcal wrote:
which of the following is equal to the average (arithmetic mean) of (x+2)^2 and (x-2)^2?

A) x^2
B) x^2+2
C) x^2 +4
D)x^2+2x
E)x^2+4x


this was taken from a powerprep question

Hi,

\(\frac{(x+2)^2 + (x-2)^2}2\)
\(=\frac{(x^2+2x+4) + (x^2-2x+4)}2\)
\(=x^2+4\)

Answer (C)

Regards,
_________________

My posts: Solving Inequalities, Solving Simultaneous equations, Divisibility Rules

My story: 640 What a blunder!

Vocabulary resource: EdPrep

Facebook page: fb.com/EdPrep

Intern
Intern
avatar
Joined: 04 Apr 2011
Posts: 10
Schools: Sloan '16
Followers: 0

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

Re: Which of the following is equal to the average (arithmetic [#permalink] New post 17 Jun 2012, 09:21
Answer: C

The arithmetic mean is the sum of the elements divided by the number of elements.
Re: Which of the following is equal to the average (arithmetic   [#permalink] 17 Jun 2012, 09:21
    Similar topics Author Replies Last post
Similar
Topics:
3 Experts publish their posts in the topic In Set T, the average (arithmetic mean) equals the median. Which of th Bunuel 2 10 Feb 2015, 07:42
1 Experts publish their posts in the topic Which of the following is equal to fozzzy 7 28 Jun 2013, 22:12
Experts publish their posts in the topic Which of the following ratios is most nearly equal to the ra GMATD11 3 20 Feb 2011, 02:56
2 Experts publish their posts in the topic If n is positive, which of the following is equal to caiyun 5 05 Nov 2008, 20:26
10 Experts publish their posts in the topic If n is positive, which of the following is equal to kook44 19 28 Jun 2006, 05:36
Display posts from previous: Sort by

Which of the following is equal to the average (arithmetic

  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®.