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10 Jun 2017, 23:06
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k+k^2+k^3<0 ?
1) 9<k^2<16
2) k+k^3<0
Sent from my iPhone using GMAT Club Forum mobile app
1) 9<k^2<16
2) k+k^3<0
Sent from my iPhone using GMAT Club Forum mobile app
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
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11 Jun 2017, 00:20
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Hi Emily,
Please look into question formatting before posting questions on the forum.
As for the question, IMO the answer should be B.
St 1: Lets take a value like +/- 3.5. Both these cases yield inconsistent answers to the given question. Insufficient.
St 2: k+k^3 can only be negative (<0) when k itself is negative. Given that, it can be concluded that k+k^2+k^3 will also always be nagative. Sufficient.
Don't forget to hit the kudos button!
Please look into question formatting before posting questions on the forum.
As for the question, IMO the answer should be B.
St 1: Lets take a value like +/- 3.5. Both these cases yield inconsistent answers to the given question. Insufficient.
St 2: k+k^3 can only be negative (<0) when k itself is negative. Given that, it can be concluded that k+k^2+k^3 will also always be nagative. Sufficient.
Don't forget to hit the kudos button!
