Manhattan GMAT Forums Forum Index » ManhattanGMAT CAT Math
Reply to topic
Adding Exponents
Spencer
Guest
Post Posted: Wed Feb 27, 2008 3:47 pm Reply with quote
One of the explanations to a math problem I was doing had the following calculation done:


(5^13 – 5^12)--->(5^12)(5-1)-->(5^12)(4)



Can anyone explain how this works?
Guest
Post Posted: Wed Feb 27, 2008 4:01 pm Reply with quote
The source is Manhattan GMAT in a problem called, "Lining Up A to H".
Spencer
Guest
Post Posted: Wed Feb 27, 2008 5:44 pm Reply with quote
I figured it out

5^13-5^12


You factor out a 5^12:

5^12(5^1-1)

5^12(5-1)

5^12(4)

g unit! thanks for all of your help
Stacey Koprince
MGMAT STAFF

Joined: 06 Mar 2007
Posts: 2427
Location: San Francisco
Post Posted: Wed Mar 12, 2008 2:44 pm Reply with quote
excellent - so glad you figured it out on your own!
Adding Exponents
All times are GMT - 5 Hours  
Page 1 of 1  
  
  
Manhattan GMAT Forums Forum Index » ManhattanGMAT CAT Math
 Reply to topic