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Data Sufficiency What is the value of x ? 1) x-9=10 2)

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Data Sufficiency What is the value of x ? 1) x-9=10 2) [#permalink] New post 14 Dec 2003, 17:24
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Data Sufficiency

What is the value of x ?

1) x-9=10
2) x^2+2x=1
------------------------------------------------------ :?
Can you please explain the answer if it is D ?
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 [#permalink] New post 14 Dec 2003, 17:38
A is suff..

B is X^2 + 2X - 1 = 0

solve for X:
X = -1+sqrt(2) or -1- sqrt(2)
not suff.
  [#permalink] 14 Dec 2003, 17:38
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