SOLUTION: I'm trying to help my daughter with the following equation: e^-x=5 - We came up with the answer being = -1.6 but her teacher said this was incorrect. Can you help?

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Question 940896: I'm trying to help my daughter with the following equation:
e^-x=5 - We came up with the answer being = -1.6 but her teacher said this was incorrect. Can you help?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
e^-x=5
ln(-x) = ln(5)
-x = ln(5)
x = -ln(5)
x =~ -1.609
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-1.6 is correct to the nearest 0.1