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exponential problem

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Hi all - anyone know how to solve this?

2^x+5 = 1/4
 Feb 16, 2012

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[input]2^x+5 = 1/4[/input]

2^x = 1/4-5 = -4.75
x = log( -4.75 , 2)
 Feb 17, 2012

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