The number of roots of equation (1 / 2) ^ x = LNX

The number of roots of equation (1 / 2) ^ x = LNX

You use images
The image of y = (1 / 2) ^ x is an exponential function over (0,1) and a decreasing function
The image of y = LNX is a logarithmic function over (1,0), increasing function
There's an intersection,
therefore
The number of roots of equation (1 / 2) ^ x = LNX is 1
Or F (x) = LNX - (1 / 2) ^ x is an increasing function
f(1)=-1/2 f(e)=1-(1/2)^e>0
f(1)f(e)