It is currently 19 Feb 2018, 17:33

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

Does (x + y)^2 + (x - y)^2 = 170?

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

Hide Tags

Expert Post
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 43810
Does (x + y)^2 + (x - y)^2 = 170? [#permalink]

Show Tags

New post 08 Feb 2018, 05:30
Expert's post
1
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

83% (01:17) correct 17% (01:13) wrong based on 29 sessions

HideShow timer Statistics

Intern
Intern
avatar
B
Joined: 24 Jun 2013
Posts: 29
GMAT ToolKit User CAT Tests
Re: Does (x + y)^2 + (x - y)^2 = 170? [#permalink]

Show Tags

New post 08 Feb 2018, 06:34
Reducing the question we get : is x2+y2= 85? ( +2xy-2xy cancel out each other and 170/2 = 85)

st1 : directly given >> suff
st2: x=y+1>> now given that x and y are consecutive numbers , so square of consecutive number summing up to 85 is 6 and 7 any other value ans is no >> insuff

A
Manager
Manager
avatar
B
Joined: 31 May 2017
Posts: 61
CAT Tests
Re: Does (x + y)^2 + (x - y)^2 = 170? [#permalink]

Show Tags

New post 08 Feb 2018, 20:22
Does (x + y)^2 + (x - y)^2 = 170?

(1) x^2 + y^2= 85
From the question stem, x^2+y^2+2xy+x^2+y^2-2xy=170
2xy cancels out on both side, which results in x^2+y^2 = 85 which matches with option A

Sufficient

(2) x = y + 1
There are more than 1 options. Hence insufficient

Ans: A
_________________

Resources
Ultimate GMAT Quantitative Megathread | ALL YOU NEED FOR QUANT ! ! !

Re: Does (x + y)^2 + (x - y)^2 = 170?   [#permalink] 08 Feb 2018, 20:22
Display posts from previous: Sort by

Does (x + y)^2 + (x - y)^2 = 170?

  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®.