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# when 9-x^2>0, x^2-2x+8>0, what is x's range? A.

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when 9-x^2>0, x^2-2x+8>0, what is x's range? A. [#permalink]

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02 Jun 2007, 06:32
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when 9-x^2>0, x^2-2x+8>0, what is x's range?

A. (-3,-2)
B. (3,2)
C. (0,3)
D. (-3,0)
E. (0)
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Joined: 04 Feb 2007
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02 Jun 2007, 07:15
9- x^2 >0 implies { -3 <x> +3 }

and

x^2-2x+8>0 is true for all x, x a real number

hence Range of x : ( -3, 3 )
Director
Joined: 13 Mar 2007
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Schools: MIT Sloan
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02 Jun 2007, 18:01
concur with Vidya,

are the answer choices/question right ?
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