It is currently 21 Oct 2017, 01:48

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# What is value of x?

Author Message
TAGS:

### Hide Tags

Senior Manager
Joined: 06 Aug 2011
Posts: 390

Kudos [?]: 235 [0], given: 82

What is value of x? [#permalink]

### Show Tags

29 Jun 2012, 09:00
1
This post was
BOOKMARKED
00:00

Difficulty:

25% (medium)

Question Stats:

65% (00:53) correct 35% (00:55) wrong based on 186 sessions

### HideShow timer Statistics

What is value of x?

(1) 4x^2-4x+1=0

(2) 4x^2-1=0
[Reveal] Spoiler: OA

_________________

Bole So Nehal.. Sat Siri Akal.. Waheguru ji help me to get 700+ score !

Kudos [?]: 235 [0], given: 82

Math Expert
Joined: 02 Sep 2009
Posts: 41891

Kudos [?]: 129068 [1], given: 12194

Re: What is value of x? [#permalink]

### Show Tags

29 Jun 2012, 09:04
1
KUDOS
Expert's post
What is value of x?

(1) 4x^2-4x+1=0 --> $$(2x-1)^2=0$$ --> $$2x-1=0$$ --> $$x=\frac{1}{2}$$. Sufficient.

(2) 4x^2-1=0 --> $$x^2=\frac{1}{4}$$ --> $$x=-\frac{1}{2}$$ or $$x=\frac{1}{2}$$. Not sufficient.

_________________

Kudos [?]: 129068 [1], given: 12194

Senior Manager
Joined: 06 Aug 2011
Posts: 390

Kudos [?]: 235 [0], given: 82

Re: What is value of x? [#permalink]

### Show Tags

29 Jun 2012, 09:15
Thanks alot bunuel .....

4x^2-4x+1=0 to (2x-1)^2 ...?? how did u simplify it?
_________________

Bole So Nehal.. Sat Siri Akal.. Waheguru ji help me to get 700+ score !

Kudos [?]: 235 [0], given: 82

Math Expert
Joined: 02 Sep 2009
Posts: 41891

Kudos [?]: 129068 [0], given: 12194

Re: What is value of x? [#permalink]

### Show Tags

29 Jun 2012, 11:00
sanjoo wrote:
Thanks alot bunuel .....

4x^2-4x+1=0 to (2x-1)^2 ...?? how did u simplify it?

$$(a-b)^2=a^2-2ab+b^2$$;
$$(2x-1)^2=(2x)^2-2*2x+1^2=4x^2-4x+1$$.

Hope it's clear.
_________________

Kudos [?]: 129068 [0], given: 12194

Senior Manager
Joined: 18 Sep 2009
Posts: 356

Kudos [?]: 589 [0], given: 2

Re: What is value of x? [#permalink]

### Show Tags

30 Jun 2012, 08:58
Hai Bunnel

can you tell me how to find that statement 1 is in (a-b)^2 farm. Is there any method behind this. Plz explain

Kudos [?]: 589 [0], given: 2

GMAT Club Legend
Joined: 09 Sep 2013
Posts: 16611

Kudos [?]: 273 [0], given: 0

Re: What is value of x? [#permalink]

### Show Tags

06 Apr 2017, 01:41
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________

Kudos [?]: 273 [0], given: 0

Re: What is value of x?   [#permalink] 06 Apr 2017, 01:41
Display posts from previous: Sort by