Thursday, 19 December 2013

analysis - For which alpha does this function have a positive solution?


For which αR does eαx1=x have a positive solution
Hint; Consider Derivatives at 0.




My attempt;
Now firstly I will rewrite this to form the function f(x)=eαx1x Now we want to see for what αR does f(x)=0 yield a positive solution.
Taking derivatives we get f(x)=αeαx1 and a x=0 we get f(0)=α1.
Now I seem confused on how to proceed, any help would be appreciated.

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