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100 points for $49 worth of Veritas practice GMATs FREE VERITAS PRACTICE GMAT EXAMS Earn 10 Points Per Post Earn 10 Points Per Thanks Earn 10 Points Per Upvote ## inequality question ##### This topic has 1 expert reply and 3 member replies ## inequality question Hi, wasn't able to solve this. Is x > 5 ? (1) x^2 > 25 (2) 2x + 7 > 0 the OA is C Thanks Master | Next Rank: 500 Posts Joined 28 Sep 2009 Posted: 106 messages Followed by: 2 members Upvotes: 26 GMAT Score: 700 (1) gives us x > 5 or x < -5. So NOT sufficient. (2) gives us 2x > -7 . x can can be 0, -3, -2,-1, 1, 2, 3..(all positive nos)...and still the equation holds. So not sufficient. Combining the two, we can see that the only values that satisfy both are numbers > 5. Hence x > 5. So this is sufficient. Last edited by asamaverick on Fri Jun 18, 2010 5:44 am; edited 1 time in total Master | Next Rank: 500 Posts Joined 05 May 2010 Posted: 294 messages Upvotes: 57 Target GMAT Score: 790 krishna kumar wrote: Hi, wasn't able to solve this. Is x > 5 ? (1) x^2 > 25 (2) 2x + 7 > 0 the OA is C Thanks from 1) x^2>25 we can conclude x >+5 and x>-5 (would like to stress that x>-5 i.e x can be -4 ,-3 -2 in that case so x can be less than 5 also) from 2 ) 2x+7 >0 x>-3.5 so x will breater -3.5 so combining this we are sure x>5 _________________ Ideation without execution is delusion ### GMAT/MBA Expert GMAT Instructor Joined 21 Apr 2010 Posted: 509 messages Followed by: 85 members Upvotes: 199 GMAT Score: 750 Both above answers are correct but you may be having trouble combining the answers - if x>5 or x,-5 AND x>3.5 - all three things have to be true together. Try drawing it out on a numberline with two lines representing the first statement on top and one line representing the second statement on the bottom.- the only answers that work are the answers that overlap - so the only answers that work are when x>5. Hope that helps a little bit. _________________ Becky Master GMAT Instructor The Princeton Review Irvine, CA Free GMAT Practice Test How can you improve your test score if you don't know your baseline score? Take a free online practice exam. Get started on achieving your dream score today! Sign up now. Master | Next Rank: 500 Posts Joined 09 Jun 2008 Posted: 233 messages Upvotes: 5 Target GMAT Score: 700+ krishna kumar wrote: Hi, wasn't able to solve this. Is x > 5 ? (1) x^2 > 25 (2) 2x + 7 > 0 the OA is C Thanks 1) x can be +-5 .thant's why we can't say for sure which argument is our x . insufficient 2)2x+7>0 2x>7 x>3.5 this also don't tell us that x>5 or not. because x can be both 4 and 6 . insufficient 1) and 2) togather is sufficient . because with 1) we know that x is 5 or -5 . from 2) we know that x is more that 3.5. • Award-winning private GMAT tutoring Register now and save up to$200

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