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

It is currently 31 Aug 2015, 16:47
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

Roots

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Manager
Manager
avatar
Joined: 22 Sep 2008
Posts: 123
Followers: 1

Kudos [?]: 39 [0], given: 0

Roots [#permalink] New post 29 Sep 2008, 06:54
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

I think these are easy question , but just beat the time

q1: √98 + √18 = ?

√116

10 √4

10 √2

14

2 √29

q2:√112 − √63 + √28 = ?

√77

9 √7

9 √3

7 √3

3 √7

q3:√7 (7 √20 − 7 √75) = ?

14 √5 − 35 √3

5 √14 − 3 √35

35 √5 − 14 √3

35 √35 − 14 √21

14 √35 − 35 √21
Director
Director
User avatar
Joined: 12 Jul 2008
Posts: 518
Schools: Wharton
Followers: 18

Kudos [?]: 127 [0], given: 0

Re: Roots [#permalink] New post 29 Sep 2008, 07:20
q1: √98 + √18 = ?

√116

10 √4

10 √2

14

2 √29


\(sqrt(98) + sqrt(18)
= sqrt(2*49) + sqrt(2*9)
= 7sqrt(2) + 3sqrt(2)
= 10sqrt(2)\)


q2:√112 − √63 + √28 = ?

√77

9 √7

9 √3

7 √3

3 √7


\(sqrt(112) - sqrt(63) + sqrt(28)
= sqrt(16*7) - sqrt(9*7) + sqrt(4*7)
= 4sqrt(7) - 3sqrt(7) + 2sqrt(7)
= 3sqrt(7)\)

q3:√7 (7 √20 − 7 √75) = ?

14 √5 − 35 √3

5 √14 − 3 √35

35 √5 − 14 √3

35 √35 − 14 √21

14 √35 − 35 √21

\(sqrt(7)*[7sqrt(20) - 7sqrt(75)]
=7sqrt(7)*[sqrt(4*5) - sqrt(25*3)]
= 7sqrt(7)*[2sqrt(5) - 5sqrt(3)]
= 14sqrt(35) - 35sqrt(21)\)
VP
VP
User avatar
Joined: 05 Jul 2008
Posts: 1431
Followers: 36

Kudos [?]: 271 [0], given: 1

Re: Roots [#permalink] New post 29 Sep 2008, 08:47
Agree with zooink.

Zooink,

Can you tell me how to generate the sqrt? Do you write the tags or can you click some where and generate such mathematical symbols?
Manager
Manager
avatar
Joined: 22 Sep 2008
Posts: 123
Followers: 1

Kudos [?]: 39 [0], given: 0

Re: Roots [#permalink] New post 29 Sep 2008, 11:31
I think zoolink has copied answer from somewhere..
his answer is in image form..

but nice explanation

Thanks
Director
Director
User avatar
Joined: 12 Jul 2008
Posts: 518
Schools: Wharton
Followers: 18

Kudos [?]: 127 [0], given: 0

Re: Roots [#permalink] New post 29 Sep 2008, 11:47
icandy wrote:
Agree with zooink.

Zooink,

Can you tell me how to generate the sqrt? Do you write the tags or can you click some where and generate such mathematical symbols?


Use the [m ] [/m ] brackets to offset math symbols.
Re: Roots   [#permalink] 29 Sep 2008, 11:47
Display posts from previous: Sort by

Roots

  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®.