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algabra equation ?

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algabra equation ? [#permalink] New post 07 Sep 2011, 02:13
hi guys
if x is a positive integer, is y^2(x^3-x+1)>75?

1)y>1
2)(x-1)^2=16

OA is C

but the equation (x-1)^2= 16 equal to x-1=4 ====> x=5
what about the negative sign? here does the equation x-1)^2=16 has 2 solutions or just one which is x-1=4 ====> x=5
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Re: algabra equation ? [#permalink] New post 07 Sep 2011, 02:27
denver2018 wrote:
hi guys
if x is a positive integer, is y^2(x^3-x+1)>75?

1)y>1
2)(x-1)^2=16

OA is C

but the equation (x-1)^2= 16 equal to x-1=4 ====> x=5
what about the negative sign? here does the equation x-1)^2=16 has 2 solutions or just one which is x-1=4 ====> x=5


You have posted your question in a wrong forum. This is a PS question and should go to:
gmat-problem-solving-ps-140/

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Please post PS questions in the PS sub-forum: gmat-problem-solving-ps-140/
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No posting of PS/DS questions is allowed in the main Math forum.


Critical Reasoning(CR): gmat-critical-reasoning-cr-139/
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Also, please hide anything and everything except the question in spoiler tag. e.g.

*************************************************
If x is a positive integer, is y^2(x^3-x+1)>75?

1)y>1
2)(x-1)^2=16

[Reveal] Spoiler: OA
OA is C

but the equation (x-1)^2= 16 equal to x-1=4 ====> x=5
what about the negative sign? here does the equation x-1)^2=16 has 2 solutions or just one which is x-1=4 ====> x=5


**************************************************

Please post this again in the appropriate forum.

Thread locked.
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Re: algabra equation ?   [#permalink] 07 Sep 2011, 02:27
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