I am using bisection method to solve an equation, but the solution always shows the first value input and I don't know where my mistake is

I am using the biscetion method to solve an equation but the solution is always the first picked value (xLeft).

bisection_method()

Error as percentage: 0
friction factor: 0.008
Solution reached in 57 iterations

Answer 1

[Walter Roberson]

D=0.1016; Q=0.00368; p=900;u=0.008; e=0;

A = (1/4)*pi*D^2;    
R = (p*D*Q)/(u*A); 

f = @(ft) 1/(-2*log((e/D)/3.7)+(2.51/(R*(ft^0.5))))^2;
syms ft
f(ft)

ans = 

simplify(ans)

ans = 

Notice the infinity, which is from the log((e/D)/3.7) when e is 0.