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cesar82 · 2008 December 21st, 04:10 PM

Is
2*|a-b| = |2a-2b|?

Can |a+b|=2|a-b| be squared as follows:
(a+b)^2 = 4 (a-b)^2?

Thanks

DWarrior · 2008 December 22nd, 04:28 AM

Yes and yes, you can show both if you use |x|=sqrt(x^2)

ps, it's absolute value, modulus has to do with remainder

cesar82 · 2008 December 22nd, 09:39 AM

Thanks

DWarrior · 2008 December 23rd, 04:19 PM

oops, you were right. Modulus can refer to absolute value, I didn't know that until today.

2008 December 21st, 04:10 PM	#1 (permalink)
cesar82 I'm done with gmat. Join Date: Nov 2008 Posts: 202	A Modulus Question Is 2*\|a-b\| = \|2a-2b\|? Can \|a+b\|=2\|a-b\| be squared as follows: (a+b)^2 = 4 (a-b)^2? Thanks

2008 December 22nd, 04:28 AM	#2 (permalink)
DWarrior TestMagic Guru-in-Training Join Date: Oct 2007 Location: New Jersey Posts: 642	Yes and yes, you can show both if you use \|x\|=sqrt(x^2) ps, it's absolute value, modulus has to do with remainder _ _ _ _ SIG _ _ _ _ If you have questions about my solutions, PM me. Some gre/gmat stuff (mostly Math): My del.icio.us bookmarks My Clipmarks bookmarks

2008 December 23rd, 04:19 PM	#4 (permalink)
DWarrior TestMagic Guru-in-Training Join Date: Oct 2007 Location: New Jersey Posts: 642	oops, you were right. Modulus can refer to absolute value, I didn't know that until today. _ _ _ _ SIG _ _ _ _ If you have questions about my solutions, PM me. Some gre/gmat stuff (mostly Math): My del.icio.us bookmarks My Clipmarks bookmarks

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2008 December 22nd, 09:39 AM	#3 (permalink)
cesar82 I'm done with gmat. Join Date: Nov 2008 Posts: 202	Thanks

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