BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem
TTP OnDemand GMAT Video Course
Featured Course

Target Test Prep GMAT OnDemand

Scott Woodbury-Stewart’s private virtual classroom — 400 hours of master-class video lessons for the GMAT Focus Edition.

  • 715+ score guarantee — highest in the industry (99th percentile)
  • 52 chapters · 1,500+ lessons · 4,000+ practice questions
  • 400 hours of video · 1,500+ instructor-led HD smartboard lessons
  • 300,000+ students accepted to Harvard, Stanford, Wharton, Booth & Sloan & more
  • 24/7 live support + weekly Zoom office hours with GMAT instructors
  • TTP AI Assist — 24/7 AI-powered virtual tutor for instant help
  • 1,200+ flashcards + AI-powered study assistant & daily calendar
  • OnDemand, LiveTeach & GMAT Bootcamp formats available
  • Also: GRE, SAT Math & Executive Assessment courses
  • MBA Admissions Consulting now available
  • 🏆 2025 EdTech Breakthrough Award: Test Prep Solution Provider of the Year
  • 200,000+ students served
  • 5-day free trial — $0 to start, no auto-billing, cancel anytime
★★★★★ 5.0 (559 reviews)
130-pt guarantee
$0 to start then $127/mo
Start Free 5-Day Trial Read 559 Reviews →

What is the value of x

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Data Sufficiency |
User avatar
Legendary Member
Posts: 1239
Joined: Tue Apr 26, 2011 6:25 amFollowed by: 26 members
Thanked: 233 times
GMAT Score:680

by sam2304 » Sat Apr 14, 2012 7:07 pm
Both are same.

1. 2x + 1 = 0, x = -1/2 SUFF
2. (x+1)^2 = x^2 = x^2 + 2x + 1 = x^2 => 2x + 1 = 0. SUFF

IMO D.
Getting defeated is just a temporary notion, giving it up is what makes it permanent.
https://gmatandbeyond.blogspot.in/
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 581
Joined: Sun Apr 03, 2011 7:53 amFollowed by: 5 members
Thanked: 52 times

by killer1387 » Sun Apr 15, 2012 3:50 am
PGMAT wrote:What is the value of x ?
(1) 2x + 1 = 0
(2) (x+1)^2 = x^2

OA D

Can some one explain how statement 2 is sufficient?

Thanks.
1) SUFFICIENT
2) (X+1-X)(X+1+X)=0=> X=UNIQUE VALUE
SUFFICIENT
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 3835
Joined: Fri Apr 02, 2010 10:00 pmFollowed by: 523 members
Location: Milpitas, CA
Thanked: 1854 times
GMAT Score:770

by Anurag@Gurome » Sun Apr 15, 2012 7:35 pm
PGMAT wrote:What is the value of x ?
(1) 2x + 1 = 0
(2) (x+1)^2 = x^2

OA D

Can some one explain how statement 2 is sufficient?

Thanks.
(1) 2x + 1 = 0 implies x = -1/2; SUFFICIENT.

(2) (x + 1)² = x²
Applying the identity, (a + b)² = a² + 2ab + b²
x² + 2x + 1 = x²
2x + 1 = 0
x = 1/2; SUFFICIENT.

The correct answer is D.
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/
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1