Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 20 Dec 2013, 09:15

In Progress:

Admissions Decisions for Duke and Sloan -  Join the chat while waiting

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

If x = 0, and x = (8xy 16y^2)^1/2 , then, in terms of y, x =

 Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:
Manager
Joined: 10 Oct 2005
Posts: 64
Followers: 1

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

If x = 0, and x = (8xy 16y^2)^1/2 , then, in terms of y, x = [#permalink]  12 Oct 2005, 12:45
If x = 0, and x = (8xy â€“ 16y^2)^1/2 , then, in terms of y, x =
A. â€“ 4y
B.y/4
C. y
D. 4y
E. 4y2
SVP
Joined: 28 May 2005
Posts: 1744
Location: Dhaka
Followers: 6

Kudos [?]: 24 [0], given: 0

[#permalink]  12 Oct 2005, 12:58
i got D.

x^2= 8xy-16y^2 or (x-4y)^2=0 therefore x=4y
_________________

hey ya......

Senior Manager
Joined: 02 Oct 2005
Posts: 307
Followers: 1

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

[#permalink]  12 Oct 2005, 13:09
Looks like the information (If x = 0) is not useful to solve this.

Should it be "If x != 0" ?
Intern
Joined: 05 May 2005
Posts: 46
Followers: 1

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

[#permalink]  12 Oct 2005, 13:53
after foiling we get (x-4y)^2 = 0

x = 4y

Current Student
Joined: 29 Jan 2005
Posts: 5260
Followers: 19

Kudos [?]: 102 [0], given: 0

[#permalink]  13 Oct 2005, 09:56
1. Plug in x=0 to get (-16y^2)^1/2
2. Factor out a -1(16y^2)^1/2
3. -1^1/2=i and (16y^2)^1/2=+/-4y
4. +/-4y*i

Clearly not an answer choice. I would just guess D and move on...
Manager
Joined: 03 Oct 2005
Posts: 90
Followers: 1

Kudos [?]: 4 [0], given: 0

[#permalink]  13 Oct 2005, 10:49
What GMATT73 said.
Senior Manager
Joined: 04 May 2005
Posts: 286
Location: CA, USA
Followers: 1

Kudos [?]: 8 [0], given: 0

[#permalink]  13 Oct 2005, 12:30
i will go for A B C D E

If x = 0, and x = (8xy â€“ 16y^2)^1/2

=> 0 = (0 - 16y^2)^1/2

=> y = 0 = x

therefore A B C D E
[#permalink] 13 Oct 2005, 12:30
Similar topics Replies Last post
Similar
Topics:
PS - x in terms of y 2 03 Oct 2006, 20:22
Help with x in terms of y?? 2 01 Mar 2007, 15:44
Maths: Y in terms of X ? 5 08 Feb 2008, 02:32
What is y in terms of x ? 4 09 Jun 2009, 19:35
2 If x>=0 and x=root(8xy - 16y^2) then, in terms of y, x= 5 17 Oct 2012, 12:13
Display posts from previous: Sort by

If x = 0, and x = (8xy 16y^2)^1/2 , then, in terms of y, x =

 Question banks Downloads My Bookmarks Reviews Important topics

 Powered by phpBB © phpBB Group and phpBB SEO Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.