Roots and Real numbers

This topic has expert replies
Newbie | Next Rank: 10 Posts
Posts: 3
Joined: Mon Mar 28, 2011 3:00 pm

Roots and Real numbers

by anu_2011 » Thu Mar 31, 2011 8:44 am
For which of the following values of x is {1-[2-(x ^1/2)]^1/2}^1/2 not defined as a real number?

Options:
1
2
3
4
5
Last edited by anu_2011 on Thu Mar 31, 2011 5:16 pm, edited 1 time in total.

Master | Next Rank: 500 Posts
Posts: 423
Joined: Fri Jun 11, 2010 7:59 am
Location: Seattle, WA
Thanked: 86 times
Followed by:2 members

by srcc25anu » Thu Mar 31, 2011 9:24 am
IMO it should be E (5) because this will make the term under square root to be a -ve number and that will not be a real number.

User avatar
Legendary Member
Posts: 582
Joined: Tue Mar 08, 2011 12:48 am
Thanked: 61 times
Followed by:6 members
GMAT Score:740

by force5 » Thu Mar 31, 2011 2:03 pm
i cannot actually comprehend if its multiplying with 1/2 or is that square root? I would request poster to review the question and clarify by editing the post.



Thanks...

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 3380
Joined: Mon Mar 03, 2008 1:20 am
Thanked: 2256 times
Followed by:1535 members
GMAT Score:800

by lunarpower » Fri Apr 01, 2011 3:56 am
force5 wrote:i cannot actually comprehend if its multiplying with 1/2 or is that square root? I would request poster to review the question and clarify by editing the post.



Thanks...
agreed -- the original post is essentially unreadable.

if this problem was originally written with the square root symbol, then please post it using the square root symbol.
it's easy enough to get a square root symbol -- just google "square root symbol", click on one of the first few pages that comes up, and then just copy and paste: √ √ √ √ (now you can just copy and paste it from this post!)

or, even better, just take a screenshot of it and post it here and/or on an image hosting site.
Ron has been teaching various standardized tests for 20 years.

--

Pueden hacerle preguntas a Ron en castellano
Potete chiedere domande a Ron in italiano
On peut poser des questions à Ron en français
Voit esittää kysymyksiä Ron:lle myös suomeksi

--

Quand on se sent bien dans un vêtement, tout peut arriver. Un bon vêtement, c'est un passeport pour le bonheur.

Yves Saint-Laurent

--

Learn more about ron