For which α∈R does eαx−1=x have a positive solution
Hint; Consider Derivatives at 0.
My attempt;
Now firstly I will rewrite this to form the function f(x)=eαx−1−x Now we want to see for what α∈R does f(x)=0 yield a positive solution.
Taking derivatives we get f′(x)=αeαx−1 and a x=0 we get f′(0)=α−1.
Now I seem confused on how to proceed, any help would be appreciated.
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