The original function of the two functions is easy to get, and the problem is to find the intersection position of the two curves.

The zero of f (x) = 4-x 2/4-2 lnx can be obtained by an iterative formula: Xn=( 16-8ln(Xn- 1)), and the initial value is X0=3.

The better method is Newton method, and the convergence speed is faster: Xn+ 1=Xn-f(Xn)/f'(Xn).