Bisection method MATLAB stuck

Question

I have written this code to implement the bisection method for finding a root of a function:

syms x

f(x) = x^3-2*x^2+5*x-10;

k = -10:10;

plot(k,f(k));

a = -2;

b = 2;

c = 0;

while f(c)~=0

    c = a+(b-a/2);

    if f(a)*f(c)<0
    
         b = c;
    end

    if f(b)*f(c)<0
    
         a = c;
    end



end

disp(c);

However the programm doesnt stop(it takes too much for it to stop).Do I not implement the bisection method correctly or what is happening?

Here is a picture of the plot of the function from -10:10

The root is obviously 2 but it cant find it.Help appreciated