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GMATPrep exponents problem

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GMATPrep exponents problem

by mjjking » Fri Mar 20, 2009 2:37 am
Thanks!
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by sacx » Fri Mar 20, 2009 6:27 am
2^x - 2^(x-2) = 3(2^13)

2^x - (2^x)/4 = 3(2^13)
2^x(1-1/4) = 3(2^13)
2^x(3/4) = 3(2^13)
dividing both sides by 3

2^x(1/4) = 2^13
2^(x-2) = 2^13

x-2 = 13
x = 15
SACX
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