MATLAB: I need use division methob

Question

Find the approximate positive solution of the following equation

By the split method, the error should not exceed 0.002.

Answer 1

A little more like this perhaps (note the way the function, f, is defined):

f = @(x) x.^3- 0.2*x.^2 - 0.2*x - 1.2;
a0=1;
b0=2;
max_iterate = 0.002;
i=0 ;
format short e
a = a0; b = b0;
c = (a+b)/2;
while b-c > max_iterate 
    i=i+1;
    fb = f(b);
    fc = f(c);
    if sign(fb)*sign(fc) <= 0
        a = c; fa = fc;
        else
        b = c; fb = fc;
    end
    c = (a+b)/2;
    iteration = [i a b c fc b-c];
    disp(iteration)
end