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Exponents

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tm03
 Post subject: Exponents
 Post Posted: Sun May 17, 2009 9:32 pm 
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Posts: 17
If 2^x - 2^x-2=3(2^13) what is the value of x?

a) 9
b) 11
c) 13
d) 15
e) 17

Answer is d)15. It seems easy but I just can not figure out how to solve this one. I am missing something here. I'll appreciate any help.
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kevinmarmstrong
 Post subject: Re: Exponents
 Post Posted: Mon May 18, 2009 2:35 pm 
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Posts: 28
Try factoring the left side
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RonPurewal
 Post subject: Re: Exponents
 Post Posted: Wed May 20, 2009 6:05 am 
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ManhattanGMAT Staff


Posts: 7146
post16795.html#p16795
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tm03
 Post subject: Re: Exponents
 Post Posted: Wed May 20, 2009 11:08 am 
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Posts: 17
Thank you very much
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JonathanSchneider
 Post subject: Re: Exponents
 Post Posted: Thu May 28, 2009 10:32 pm 
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ManhattanGMAT Staff


Posts: 480
Location: Durham, NC
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