University Calculus Question (maximum values with 'e')?

Dave

New member
Firstly, I don't really want the answer to this question, more of a nudge in the right direction.

The question is:
Find the maximum value of
g(t) = t*e^(-3t)

So I know that a maximum value occurs at one of the critical points (end points or when g'(t) = 0 (since the domain is not given, I'm assuming (-infinity, infinity) and therefore will not both with the endpoints)).

I get g'(t) = e^(-3t) * (1 - 3t) OR g'(t) = e^(-3t) - 3t*e^(-3t) (same thing).

At this point you solve for the equation equaling 0, but I'm not sure how to go about doing this (I suppose this was more of a logarithm question than a calculus question...)

Thanks in advance, any help is much appreciated.
 
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