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

 It is currently 07 Jul 2015, 12:17

### 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

# If rs = 1, what is the value of 2(r+s)^2 / 2(r-s)^2

Author Message
TAGS:
SVP
Joined: 16 Oct 2003
Posts: 1813
Followers: 4

Kudos [?]: 56 [0], given: 0

If rs = 1, what is the value of 2(r+s)^2 / 2(r-s)^2 [#permalink]  22 Jan 2006, 22:53
If rs = 1, what is the value of 2(r+s)^2 / 2(r-s)^2
Intern
Joined: 27 Jun 2005
Posts: 4
Followers: 0

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

it looks the ques shud b

if rs=1, what is the val of 2^((r+s)^2)/2^((r-s)^2).

if it is the case, it is 16. ==> 2^2/2^-2 ==> 24 = 16.

Director
Joined: 09 Oct 2005
Posts: 720
Followers: 3

Kudos [?]: 14 [0], given: 0

Re: Solve this [#permalink]  22 Jan 2006, 23:14
Bhai wrote:
If rs = 1, what is the value of 2(r+s)^2 / 2(r-s)^2

No solution for this one Bhai!Probably some typo in the question stem
_________________

IE IMBA 2010

SVP
Joined: 16 Oct 2003
Posts: 1813
Followers: 4

Kudos [?]: 56 [0], given: 0

Please see this from GMATPrep. I wonder if this one is "not-score" question.
Attachments

1.JPG [ 6.64 KiB | Viewed 561 times ]

Director
Joined: 09 Oct 2005
Posts: 720
Followers: 3

Kudos [?]: 14 [0], given: 0

Bhai wrote:
Please see this from GMATPrep. I wonder if this one is "not-score" question.

http://www.gmatclub.com/phpbb/viewtopic.php?t=25643
Agree with you Bhai it looks so simple but can't solve it
BTW maybe you have OE for this one?
_________________

IE IMBA 2010

Manager
Joined: 02 Oct 2005
Posts: 53
Followers: 1

Kudos [?]: 5 [0], given: 0

If x and y are integers, then the value is infinity. If no bounds are given, then cannot be solved.
SVP
Joined: 16 Oct 2003
Posts: 1813
Followers: 4

Kudos [?]: 56 [0], given: 0

....and I thought I was
Senior Manager
Joined: 11 Jan 2006
Posts: 269
Location: Chennai,India
Followers: 1

Kudos [?]: 3 [0], given: 0

the same question has already been discussed as shown by yurik !

the question stem is wrong!
_________________

vazlkaiye porkalam vazltuthan parkanum.... porkalam maralam porkalthan maruma

VP
Joined: 21 Sep 2003
Posts: 1065
Location: USA
Followers: 3

Kudos [?]: 40 [0], given: 0

Bhai wrote:
....and I thought I was

I know. Someone asked the same question previously and I was ed too.
_________________

"To dream anything that you want to dream, that is the beauty of the human mind. To do anything that you want to do, that is the strength of the human will. To trust yourself, to test your limits, that is the courage to succeed."

- Bernard Edmonds

GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5068
Location: Singapore
Followers: 23

Kudos [?]: 195 [0], given: 0

2(r^2+2rs+s^2)/2(r^2-2rs+s^2)

We know rs =1, so:

2(r^2+2rs+s^2)/2(r^2-2rs+s^2)

= 2(r^2+2+s^2)/2(r^2-2+s^2)

If rs=1, then (r,s) = (1,1) or (-1,-1). For both cases, r^2 and s^2 = 1.

So :

= 2(1+2+1)/2(1-2+1)

= Indefinite
Director
Joined: 09 Oct 2005
Posts: 720
Followers: 3

Kudos [?]: 14 [0], given: 0

ywilfred wrote:
2(r^2+2rs+s^2)/2(r^2-2rs+s^2)

We know rs =1, so:

2(r^2+2rs+s^2)/2(r^2-2rs+s^2)

= 2(r^2+2+s^2)/2(r^2-2+s^2)

If rs=1, then (r,s) = (1,1) or (-1,-1). For both cases, r^2 and s^2 = 1.

So :

= 2(1+2+1)/2(1-2+1)

= Indefinite

What if r and s are not integers? for example r=1/2 s= 2 or r=2 s =1/2
_________________

IE IMBA 2010

Manager
Joined: 02 Oct 2005
Posts: 53
Followers: 1

Kudos [?]: 5 [0], given: 0

ywilfred wrote:
2(r^2+2rs+s^2)/2(r^2-2rs+s^2)

We know rs =1, so:

2(r^2+2rs+s^2)/2(r^2-2rs+s^2)

= 2(r^2+2+s^2)/2(r^2-2+s^2)

If rs=1, then (r,s) = (1,1) or (-1,-1). For both cases, r^2 and s^2 = 1.

So :

= 2(1+2+1)/2(1-2+1)

= Indefinite

Wilfred, if I were you and could assume x,y are integers then its obvious they are either 1,1 or -1,-1 in that case, I would not have to do the 1/2 pg long calculations to figure out that the ans is indefinite! The Dr contains (x-y)^2, which is obviously zero and hence the expression infinite!!!!!
Similar topics Replies Last post
Similar
Topics:
If r☉s = rs + r + s, then for what value of s is r 3 27 Nov 2007, 15:22
if r@s = rs+r+s, then for what value of s is r@sm equal to r 3 06 Sep 2006, 10:54
XY=1 What is the value of / 4 09 Jul 2006, 16:39
If a and b are integers, then what is the value of ? (1) 7 28 Jun 2006, 02:32
what is the value of x? assume x is an integer. (1) 10 09 Sep 2005, 07:21
Display posts from previous: Sort by