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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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Joined: 31 Aug 2007
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Is A positive? 1. x^2-2*x+A is positive for all x 2. A*x^2+1 [#permalink]  25 Dec 2007, 15:47
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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
Joined: 17 Nov 2007
Posts: 3574
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40
Followers: 414

Kudos [?]: 2244 [0], given: 359

Expert's post
Intern
Joined: 29 Aug 2007
Posts: 4
Followers: 0

Kudos [?]: 0 [0], given: 0

Re: DS number theory [#permalink]  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).
SVP
Joined: 28 Dec 2005
Posts: 1579
Followers: 2

Kudos [?]: 91 [0], given: 2

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)
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