It is currently 19 Apr 2018, 15:48

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

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Need Help- Addition and Subtraction under Square Roots

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

Hide Tags

Intern
Intern
avatar
B
Joined: 17 Dec 2016
Posts: 8
Location: United States (VA)
Schools: Kelley '21
GMAT 1: 450 Q21 V24
GPA: 3.81
Need Help- Addition and Subtraction under Square Roots [#permalink]

Show Tags

New post 14 Apr 2018, 07:17
Hello

I am having difficulty with how to simplify addition and subtraction under a square root. Below is the problem and how it is stated in the Foundations of Math Manhattan Prep book. I also attached a copy of me trying to work out the problem. (AJ-WORK1 AND AJ-WORK2) The other attachment is the solution info that the book provides which isn't that clear to me. If someone can explain what I am doing wrong or how to look at this problem in a different way as well as some other examples perhaps ; that would be really great.

QUESTION #56 from Chapter 3 in FOM
Simplify the following root:Express expressions as integers

√(36^2 +15^2)

Thanks in advance

Felling super frustrated-AJ
Attachments

AJ-EXPLANTION-56.pdf [73.07 KiB]
Downloaded 3 times

To download please login or register as a user

AJ-WORK2.pdf [118.87 KiB]
Downloaded 3 times

To download please login or register as a user

AJ-WORK1.pdf [112.3 KiB]
Downloaded 3 times

To download please login or register as a user

Senior Manager
Senior Manager
avatar
V
Joined: 30 Jan 2016
Posts: 494
Location: United States (MA)
Reviews Badge
Need Help- Addition and Subtraction under Square Roots [#permalink]

Show Tags

New post 15 Apr 2018, 09:53
Hi Lnstnbass4,

I guess you made a mistake when you taking \(3^2\) out.

\(\sqrt{36^2+15^2}\)=\(\sqrt{(2^2*3^2)^2+(3*5)^2}\)=\(\sqrt{2^4*3^4+3^2*5^2}\)=\(\sqrt{3^2(2^4*3^2+5^2)}\)=\(\sqrt{3^2(16*9+25)}\)=\(\sqrt{3^2(144+25)}\)=\(\sqrt{3^2*169}\)=\(\sqrt{3^2*13^2}\)=3*13=39

Hope this helps!
_________________

本当のライバルは昨日までの自分

Need Help- Addition and Subtraction under Square Roots   [#permalink] 15 Apr 2018, 09:53
Display posts from previous: Sort by

Need Help- Addition and Subtraction under Square Roots

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


GMAT Club MBA Forum Home| About| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

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

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®.