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Try this one out.. What is the value of x^2 + y^2 ? 1. x^2 +

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Manager
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Try this one out.. What is the value of x^2 + y^2 ? 1. x^2 + [#permalink] New post 04 Oct 2010, 17:06
00:00
A
B
C
D
E

Difficulty:

  95% (hard)

Question Stats:

25% (02:48) correct 75% (01:19) wrong based on 25 sessions
Try this one out..

What is the value of x^2 + y^2?

1. x^2 + y^2 = 2xy + 1
2. x^2 + y^2 = 4 - 2xy

OA is provided, but I am getting a different answer..
[Reveal] Spoiler: OA
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Re: Binomials [#permalink] New post 04 Oct 2010, 17:51
1) it's given in terms of xy, insufficient

2) again same problem, insufficient

1+2) add together the equations and divide by 2. X^2+y^2=2.5
sufficient

Answer is (c)

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Manager
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Re: Binomials [#permalink] New post 04 Oct 2010, 18:34
shrouded1 wrote:
1) it's given in terms of xy, insufficient

2) again same problem, insufficient

1+2) add together the equations and divide by 2. X^2+y^2=2.5
sufficient

Answer is (c)

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Yup I get the same thing.. OA must be wrong
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Re: Binomials [#permalink] New post 04 Oct 2010, 19:37
Yes.. I get C too.. OA must be wrong..
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Re: Binomials [#permalink] New post 16 Oct 2010, 06:14
shd be C according to me as well...
Re: Binomials   [#permalink] 16 Oct 2010, 06:14
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Try this one out.. What is the value of x^2 + y^2 ? 1. x^2 +

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