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e^(2 x)-3 e^x-4=0
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sign e^x =t than will get t^2 -3t -4=0 (t-4)(t+1)=0 t-4=0 t=4 t+1=0 t=-1 e^x =4 lne^x =lne^4 xlne=4lne x=4 e^x =-1 not is possibile
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