(b) ln(x)+ln(x-1)=1 we have that x>1 from definition of log ln(x)+ln(x-1)=ln( x*(x-1) )=1 e^ln( x*(x-1) ) =e^1 x^2-x-e=0 D=1+4e x1=(1+sqrt(1+4e) )/2 x2=(1-sqrt(1+4e) )/2
x2<1 so it cant be a root so x1=(1+sqrt(1+4e) )/2 is a solution
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