TestMagic

rainbownlife · 2008 April 22nd, 10:22 PM

Please show steps to solve this one...

krovvidy · 2008 April 23rd, 02:49 AM

I reckon the question should be read as ...

If xy=1 then what is 2^[(x+y)^2]/2^[(x-y)^2]?

i.e., 2^{[(x+y)^2] - [(x-y)^2]}
i.e., 2^{(x^2 + y^2 + 2xy) - (x^2 + y^2 - 2xy)}
i.e., 2^(4xy)
i.e., 2^4
= 16

DWarrior · 2008 April 23rd, 05:23 AM

wait, it's 2^(x+y)^2?

The document looks like 2*(x+2)^2, since when did ( become ^?

krovvidy · 2008 April 23rd, 05:33 AM

Unfortunately that's how it looked in GMATPrep ... but if you try to solve it you'd kind of know ...

Moreover, why would the question divide 2 by 2 !

rainbownlife · 2008 April 23rd, 07:17 PM

How can GMATPrep display incorrectly???

I too was confused by 2 in both numerator and denominator.
Is there an issue with this question? How can gmatprep have an issue?

People who have already taken the test, can we see such display problem on the real test ??

2008 April 23rd, 05:23 AM	#3 (permalink)
DWarrior TestMagic Guru-in-Training Join Date: Oct 2007 Location: New Jersey Posts: 642	wait, it's 2^(x+y)^2? The document looks like 2*(x+2)^2, since when did ( become ^? _ _ _ _ SIG _ _ _ _ If you have questions about my solutions, PM me. Some gre/gmat stuff (mostly Math): My del.icio.us bookmarks My Clipmarks bookmarks

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

2008 April 23rd, 02:49 AM	#2 (permalink)
krovvidy Done with GMAT (740) Join Date: Feb 2008 Posts: 818	I reckon the question should be read as ... If xy=1 then what is 2^[(x+y)^2]/2^[(x-y)^2]? i.e., 2^{[(x+y)^2] - [(x-y)^2]} i.e., 2^{(x^2 + y^2 + 2xy) - (x^2 + y^2 - 2xy)} i.e., 2^(4xy) i.e., 2^4 = 16

2008 April 23rd, 05:33 AM	#4 (permalink)
krovvidy Done with GMAT (740) Join Date: Feb 2008 Posts: 818	Unfortunately that's how it looked in GMATPrep ... but if you try to solve it you'd kind of know ... Moreover, why would the question divide 2 by 2 !

2008 April 23rd, 07:17 PM	#5 (permalink)
rainbownlife I Can. Join Date: Feb 2008 Posts: 174	How can GMATPrep display incorrectly??? I too was confused by 2 in both numerator and denominator. Is there an issue with this question? How can gmatprep have an issue? People who have already taken the test, can we see such display problem on the real test ??

TestMagic

Free GMAT, GRE, SAT Test, TOEFL practice tests