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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 ## OG 11 #98 ##### This topic has 1 expert reply and 4 member replies ## OG 11 #98 If x(2x+1)=0 and (x+1/2)(2x-3)=0 then x= A) -3 B) -1/2 C) 0 D) 1/2 E) 3/2 Answer is 0 or -1/2? As a linear equation x(2x+1) can give both 0 and -1/2 right? ### GMAT/MBA Expert GMAT Instructor Joined 02 Apr 2010 Posted: 3835 messages Followed by: 523 members Upvotes: 1854 GMAT Score: 770 singalong wrote: If x(2x+1)=0 and (x+1/2)(2x-3)=0 then x= From x(2x + 1) = 0, we have either x = 0 or x = -1/2 For, x = 0, (x + 1/2)(2x - 3) = -3/2 ---> Doesn't satisfy equation 2 for x = -1/2, (x + 1/2)(2x - 3) = 0 ---> Satisfies equation 2 Hence, x = -1/2 The correct answer is B Quote: As a linear equation x(2x+1) can give both 0 and -1/2 right? x(2x + 1) = 0 is not a linear equation, it's a quadratic equation. _________________ Anurag Mairal, Ph.D., MBA GMAT Expert, Admissions and Career Guidance Gurome, Inc. 1-800-566-4043 (USA) Join Our Facebook Groups GMAT with Gurome https://www.facebook.com/groups/272466352793633/ Admissions with Gurome https://www.facebook.com/groups/461459690536574/ Career Advising with Gurome https://www.facebook.com/groups/360435787349781/ Senior | Next Rank: 100 Posts Joined 29 Nov 2009 Posted: 54 messages Upvotes: 4 Test Date: Not Decided Target GMAT Score: 750 GMAT Score: N.A x should be -1/2 as it satisfies both the quadratic equations. Hence answer should be B Senior | Next Rank: 100 Posts Joined 09 Feb 2011 Posted: 95 messages Followed by: 1 members Upvotes: 1 thanks Senior | Next Rank: 100 Posts Joined 13 Mar 2011 Posted: 99 messages singalong ... the best way to solve this question is to plug the answer choices into the question to see which answer choice satisfies both equations: -1/2 satisfies both equations IMO B is the way to go here Legendary Member Joined 26 Jul 2011 Posted: 2789 messages Followed by: 43 members Upvotes: 206 Target GMAT Score: 700+ GMAT Score: 640 B: -1/2 • Get 300+ Practice Questions 25 Video lessons and 6 Webinars for FREE Available with Beat the GMAT members only code • Free Trial & Practice Exam BEAT THE GMAT EXCLUSIVE Available with Beat the GMAT members only code • Free Veritas GMAT Class Experience Lesson 1 Live Free Available with Beat the GMAT members only code • 5-Day Free Trial 5-day free, full-access trial TTP Quant Available with Beat the GMAT members only code • Free Practice Test & Review How would you score if you took the GMAT Available with Beat the GMAT members only code • 1 Hour Free BEAT THE GMAT EXCLUSIVE Available with Beat the GMAT members only code • FREE GMAT Exam Know how you'd score today for$0

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