SOLUTION: Hi what's the domain of log(e^(2x) - 3e^x -4). e^(2x) - 3e^x -4>0 --> e^x = t t^2-3t-4>0 t=(3+19^(1/2))/-8 --> (3+19^(1/2))/-8 = e^x How can I continue? thanks

Question 865865: Hi what's the domain of log(e^(2x) - 3e^x -4).
e^(2x) - 3e^x -4>0 --> e^x = t
t^2-3t-4>0
t=(3+19^(1/2))/-8 --> (3+19^(1/2))/-8 = e^x
How can I continue? thanks
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Not sure how you got from line 3 to line 4.

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The second solution is not possible so we discard it.

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