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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?


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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


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