Check GMAT Club Decision Tracker for the Latest School Decision Releases https://gmatclub.com/AppTrack

 It is currently 28 May 2017, 15:52

### 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

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# If x + y = a and x тАУ y = b, then 2xy

Author Message
Manager
Joined: 07 Jul 2003
Posts: 56
Followers: 2

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

If x + y = a and x тАУ y = b, then 2xy [#permalink]

### Show Tags

18 Feb 2004, 12:00
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

If x + y = a and x тАУ y = b, then 2xy =
Senior Manager
Joined: 05 May 2003
Posts: 424
Location: Aus
Followers: 2

Kudos [?]: 10 [0], given: 0

### Show Tags

18 Feb 2004, 13:32
2xy = a power 2 - (x power 2 + y power 2 )
or
2xy = (x power 2 + y power 2) - b power 2
Senior Manager
Joined: 23 Aug 2003
Posts: 461
Location: In the middle of nowhere
Followers: 1

Kudos [?]: 24 [0], given: 0

### Show Tags

18 Feb 2004, 13:49
x + y = a
x тАУ y = b

2x=a+b x=a+b/2
2y = a-b y=a-b/2

2xy =(a+b/2) * (a-b/2)
2xy = 2/4((a+b)*(a-b))

2xy = 1/2(a^2-b^2)

Vivek.
_________________

"Start By Doing What Is Necessary ,Then What Is Possible & Suddenly You Will Realise That You Are Doing The Impossible"

Senior Manager
Joined: 30 Aug 2003
Posts: 322
Location: dallas , tx
Followers: 1

Kudos [?]: 27 [0], given: 0

### Show Tags

18 Feb 2004, 14:06
I got the same...a^2 -b^2/2
_________________

shubhangi

18 Feb 2004, 14:06
Display posts from previous: Sort by