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Is A positive? 1. x^2-2*x+A is positive for all x 2. A*x^2+1

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Is A positive? 1. x^2-2*x+A is positive for all x 2. A*x^2+1 [#permalink] New post 25 Dec 2007, 15:47
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A
B
C
D
E

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Is A positive?
1. x^2-2*x+A is positive for all x
2. A*x^2+1 is positive for all x
CEO
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Joined: 17 Nov 2007
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Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
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 [#permalink] New post 26 Dec 2007, 09:35
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Re: DS number theory [#permalink] New post 26 Dec 2007, 09:46
young_gun wrote:
Is A positive?
1. x^2-2*x+A is positive for all x
2. A*x^2+1 is positive for all x


i think the answer is (B). :-D
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 [#permalink] New post 26 Dec 2007, 15:38
so did we ever finalize and justify how the OA is A ?

For stat 1, i was just able to narrow it down to the fact that A > x(2-x)
  [#permalink] 26 Dec 2007, 15:38
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Is A positive? 1. x^2-2*x+A is positive for all x 2. A*x^2+1

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