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## gmat prep q

This topic has 2 member replies
yvonne12 Master | Next Rank: 500 Posts
Joined
07 Feb 2007
Posted:
144 messages

#### gmat prep q

Wed Mar 07, 2007 8:52 am
if xy=1 what is the value of 2^(x+y)^2 / 2^(x-y)^2

ans.16

can someone pls explain

yvonne12 Master | Next Rank: 500 Posts
Joined
07 Feb 2007
Posted:
144 messages
Wed Mar 07, 2007 11:04 am
gotcha , thanks

sapnalakhi Newbie | Next Rank: 10 Posts
Joined
28 Feb 2007
Posted:
3 messages
Wed Mar 07, 2007 10:04 am
The above expression can be simplified as

2^ (x+y)^2 - (x - y)^2

= 2^4xy

= 2^4

= 16

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