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Question how to solve

 

2^-a = 0,9 

 

clear explanation please

 Apr 11, 2018
 #1
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24a - 2

 Apr 11, 2018
 #2
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 thats no help ??

 Apr 11, 2018
 #3
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2^-a = 0,9                                      Take the log of both sides

-a log(2) =log(0.9)                          Divide both sides by log(2)

-a = log(0.9) / log(2)

-a =-0.152                                      Multiply both sides by (-1)

a = 0.152

 Apr 11, 2018

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