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If 2^x - 2^(x-2) = 3(2^13), what is x?

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rlockton
 
 

If 2^x - 2^(x-2) = 3(2^13), what is x?

by rlockton Fri Nov 28, 2008 7:00 pm

If 2^x - 2^(x-2) = 3(2^13), what is x?

A. 9
B. 11
C. 13
D. 15
E. 17

Answer D = 15.

Can anyone please explain how to answer this one? Thanks!
RonPurewal
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Posts: 19744
Joined: Tue Aug 14, 2007 8:23 am
 

by RonPurewal Sat Nov 29, 2008 7:46 am

http://www.manhattangmat.com/forums/post18783.html
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