GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 18 Oct 2019, 04:51

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.

Close

Request Expert Reply

Confirm Cancel

What is the average (arithmetic mean) of (√8 + √2)^2 and (√8 − √2)^2 ?

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Find Similar Topics 
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 58458
What is the average (arithmetic mean) of (√8 + √2)^2 and (√8 − √2)^2 ?  [#permalink]

Show Tags

New post 17 Oct 2018, 02:23
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

88% (01:01) correct 12% (01:29) wrong based on 50 sessions

HideShow timer Statistics

GMAT Club Legend
GMAT Club Legend
User avatar
V
Joined: 12 Sep 2015
Posts: 4007
Location: Canada
Re: What is the average (arithmetic mean) of (√8 + √2)^2 and (√8 − √2)^2 ?  [#permalink]

Show Tags

New post 17 Oct 2018, 06:42
Top Contributor
Bunuel wrote:
What is the average (arithmetic mean) of (√8 + √2)² and (√8 − √2)² ?


A. 4
B. 5
C. 8
D. 10
E. 12


(√8 + √2)² = (√8 + √2)(√8 + √2)
= 8 + √16 + √16 + 2
= 8 + 4 + 4 + 2
= 18


(√8 - √2)² = (√8 - √2)(√8 - √2)
= 8 - √16 - √16 + 2
= 8 - 4 - 4 + 2
= 2


So, the average = [(√8 + √2)² + (√8 - √2)²]/2
= [18 + 2]/2
= 20/2
= 10

RELATED VIDEO FROM OUR COURSE

_________________
Test confidently with gmatprepnow.com
Image
GMAT Club Bot
Re: What is the average (arithmetic mean) of (√8 + √2)^2 and (√8 − √2)^2 ?   [#permalink] 17 Oct 2018, 06:42
Display posts from previous: Sort by

What is the average (arithmetic mean) of (√8 + √2)^2 and (√8 − √2)^2 ?

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  





Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne