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inequalities

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inequalities [#permalink] New post 06 Aug 2006, 07:23
please ignore it...

slip on 5^3=125 not 75 :) :oops:


I don't know if I can post questions from previous challenges.
Let me know your opinion, since I do not "agree" with the answer
Consider this data sufficiency question:

is y^2*(x^3-x+1) >75 . Consider x positive integer
1.Y>1
2.(x-1)^2=16

notice it's never mentioned Y is an integer...

let me know your opinion :?:

Last edited by ugo_castelo on 07 Aug 2006, 05:02, edited 1 time in total.
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Re: inequalities [#permalink] New post 06 Aug 2006, 13:07
ugo_castelo wrote:
I don't know if I can post questions from previous challenges.
Let me know your opinion, since I do not "agree" with the answer
Consider this data sufficiency question:

is y^2*(x^3-x+1) >75 . Consider x positive integer
1.Y>1
2.(x-1)^2=16

notice it's never mentioned Y is an integer...

let me know your opinion :?:


(1) y>1
if y =2, x=1 4>75 No
if y= 10 , x = 1: 100>75 Yes

BCE

(2)
x-1 = +- 4
x= -3 or 5
since x is +ve x=5
y^2(121) > 75
is y=1 yes
if y=1/2 No
CE

(1)&(2)
If y>1 then y^2(121) > 75

Hence
C
Re: inequalities   [#permalink] 06 Aug 2006, 13:07
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