Check GMAT Club Decision Tracker for the Latest School Decision Releases https://gmatclub.com/AppTrack

 It is currently 29 May 2017, 23:09

### 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 the value of x?

Author Message
TAGS:

### Hide Tags

Director
Joined: 21 Dec 2009
Posts: 585
Concentration: Entrepreneurship, Finance
Followers: 18

Kudos [?]: 705 [1] , given: 20

What is the value of x? [#permalink]

### Show Tags

29 Nov 2012, 12:02
1
KUDOS
3
This post was
BOOKMARKED
00:00

Difficulty:

45% (medium)

Question Stats:

61% (02:25) correct 39% (01:34) wrong based on 89 sessions

### HideShow timer Statistics

What is the value of x?

(1) 3x^2 + 8x + 16/3 = 0
(2) 15x^2 + 80/3 = -40x
[Reveal] Spoiler: OA

_________________

KUDOS me if you feel my contribution has helped you.

Math Expert
Joined: 02 Sep 2009
Posts: 39066
Followers: 7758

Kudos [?]: 106589 [0], given: 11630

What is the value of x? [#permalink]

### Show Tags

29 Nov 2012, 13:54
Expert's post
1
This post was
BOOKMARKED
What is the value of x?

(1) 3x^2 + 8x + 16/3 = 0 --> multiply by 3: $$9x^2+24x+16=0$$ --> $$(3x+4)^2=0$$ --> $$x=-4/3$$. Sufficient.

(2) 15x^2 + 80/3 = -40x --> multiply by 3/5: $$9x^2+16=-24x$$ --> $$9x^2+24x+16=0$$ --> $$(3x+4)^2=0$$ --> $$x=-4/3$$. Sufficient.

_________________
Director
Joined: 21 Dec 2009
Posts: 585
Concentration: Entrepreneurship, Finance
Followers: 18

Kudos [?]: 705 [0], given: 20

Re: What is the value of x? [#permalink]

### Show Tags

29 Nov 2012, 15:49
0k, that's a perfect square.
Otherwise, I reduced to the standard quadratic form: ax^2 + bx + c and factorize.
9x^2 + 24x + 16 = 0
9x^2 + 12x + 12x + 16 = 0
3x(3x+4) + 4(3x+4)=0
(3x + 4)^2 = 0

Or,
x^2 + (8/3)x + (4/3)^2 = 0 [(8/3)^2 = 4*(1)(16/9)]
(x + 4/3)^2 = 0....x= -4/3
_________________

KUDOS me if you feel my contribution has helped you.

GMAT Club Legend
Joined: 09 Sep 2013
Posts: 15525
Followers: 651

Kudos [?]: 211 [0], given: 0

Re: What is the value of x? [#permalink]

### Show Tags

28 Aug 2014, 05:22
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.
_________________
GMAT Club Legend
Joined: 09 Sep 2013
Posts: 15525
Followers: 651

Kudos [?]: 211 [0], given: 0

Re: What is the value of x? [#permalink]

### Show Tags

24 Feb 2016, 20:27
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.
_________________
CEO
Joined: 17 Jul 2014
Posts: 2509
Location: United States (IL)
Concentration: Finance, Economics
Schools: Stanford '19 (D)
GMAT 1: 650 Q49 V30
GPA: 3.92
WE: General Management (Transportation)
Followers: 26

Kudos [?]: 345 [0], given: 169

Re: What is the value of x? [#permalink]

### Show Tags

05 Apr 2016, 18:21
gmatbull wrote:
What is the value of x?

(1) 3x^2 + 8x + 16/3 = 0
(2) 15x^2 + 80/3 = -40x

1 can be rewritten as (3x+4)^2 so we can find X.
2. can be rewritten as:
45x^2 + 80 +120x = 0
divide by 5:
9x^2 + 16+24x=0
basically the same equation
we can factor out (3x+4)^2 = 0

D
Re: What is the value of x?   [#permalink] 05 Apr 2016, 18:21
Similar topics Replies Last post
Similar
Topics:
3 What is the value of x + 7 ? 14 01 Jul 2014, 10:06
31 What is the value of integer x ? 11 15 Feb 2016, 09:11
8 What is the value of x? 6 05 May 2016, 14:17
4 What is the value of x/yz? 10 16 Sep 2016, 15:54
7 What is the value of x? 9 19 Feb 2014, 00:14
Display posts from previous: Sort by