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Can you explain this one?

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Source: — Problem Solving |
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Re: Can you explain this one?

by sudhir3127 » Fri Aug 22, 2008 4:01 am
raju232007 wrote:If x*y=1, find ((x+y)^2)/((x-y)^2)

options were
A.2
B.4
C.8
D.16
E.24
please post the question correctly and thoroughly search the forum before starting a new thread... this question has been answered earlier...

if i remember it shud be 16. and i reads like

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

2 ^(x2+y^2+2xy)- (x2+y^2-2xy)

thus ur left with

2^4xy

as xy = 1

its 2^4= 16...

hope that helps...
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by raju232007 » Fri Aug 22, 2008 4:25 am
yeah.maybe i shud hv checkd out d forum first.wil do dat from nxt time onwards..neways thnx for the help.
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