BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

Rational numbers Question (Source GMAT prep)

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Problem Solving |
Senior | Next Rank: 100 Posts
Posts: 43
Joined: Sun Feb 18, 2007 5:59 am

by keepsmilinyaar » Wed Sep 12, 2007 8:25 pm
what are the options?
Top
Senior | Next Rank: 100 Posts
Posts: 71
Joined: Wed Aug 22, 2007 12:29 pm
Location: USA
Thanked: 12 times
Followed by:1 members

Your question is probably incomplete??

by wizardofwashington » Wed Sep 12, 2007 8:41 pm
Looks like this in an incomplete question. I dug around the web (thanks to Google) and found something very similar on Test Magic. Mach, may be you can verify if this is indeed correct or not. The question should be:
(sqrt(9+sqrt80)+sqrt(9-sqrt80) )^2

Solution, which I know most of you will do with your eyes closed, is here:

Use the formula (a+b)^2 = a^2 + b^2 + 2ab

9+sqrt80+9-sqrt80 + 2*sqrt(9^2 - 80)
= 18 + 2*1 =20 (thanks to Mits83 from TestMagic)

For those who care, here is the link to the TestMagic thread:
https://www.urch.com/forums/gmat-problem ... p-2-a.html
A falling tree resounds... but a forest grows in silence...
Top
Post new topic Post Reply
• Page 1 of 1