hwo would i find a root usiong fzero

    >> f = @(x) 2-10*x*exp(-0.8*x);
    >> fplot(f,[0 10])
    >> grid on 

function [xmin,fmin,ea,iter] = lab_19(f,xlow,xup,es,maxit)
    if nargin<3, error('need 3 inputs')
    if nargin<4 || isempty(es),es = .0001; end
    if nargin<5 || isempty(maxit), maxit=50; end
    %text file iterations
    fid = fopen('golden_out.txt','w');
    fprintf(fid,'iter.\t xlow\t f(xlow)\t x2\t\t f(x2)\t\t x1\t\t ');
    fprintf(fid,'f(x1)\t\t xup\t\t f(xup)\t\t\t ea\n');

      %find the root
      phi = 0.54*(1+sqrt(5));
      x1 =xlow+(phi-1)*(xup-xlow); x2 = xlow+xup-x1;
      flow = f(xlow); fup = f(xup); f1 = f(x1); f2 = f(x2);

Answer 1

[Star Strider]

If you just want to find and plot the roots, this brute force approach works:

f = @(x) 2-10*x.*exp(-0.8*x);

froot1 = fzero(f, 1);
froot2 = fzero(f, 10);

fplot(f,[0 10])
hold on
plot([froot1 froot2], f([froot1 froot2]), 'r+')
grid on