
It is currently Tue Jun 18, 2019 6:02 pm

View unanswered posts  View active topics

Page 1 of 1

[ 2 posts ] 

Author 
Message 
questioner

Post subject: GMAT Symbols Posted: Wed Oct 05, 2011 3:45 pm 

Joined: Sun May 30, 2010 3:15 am Posts: 424

If a#b = (a – b)(a + b) then what is the value of a#b + b#a? A. 2ab B. 0 C. ab D. a² + b² E. 2ab
(B) Note that when we calculate b#a we must switch a with b in the expression for a#b.
a#b – b#a can be calculated in several ways. The fastest way is to see the formula for difference of squares. a#b = (a – b)(a + b) = a² – b². Therefore b#a = b² – a². So a#b – b#a = a² – b² – a² + b² = 0. The answer is (B).  What does the # symbol mean in these types of questions?


Top 


Gennadiy

Post subject: Re: math (test 3, qt. 11): symbols Posted: Wed Oct 05, 2011 3:55 pm 

Joined: Sun May 30, 2010 2:23 am Posts: 498


Top 



Page 1 of 1

[ 2 posts ] 

Who is online 
Users browsing this forum: No registered users and 3 guests 

You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot post attachments in this forum

