Question

Estimate all of the zero of x3-x2-2x+1 graphically Use your code to refine the graphical estimates Hand in copies of your graph, your code for Newton's method and the command window where the functions were called

Answer 1

%function file

function zero = NewtonZeroCubic(x0)
%x0 is the initial guess
f=@(x)x^3-x^2-2*x+1;
df=@(x)3*x^2-2*x-2;
while(abs(f(x0))>.0000001)
    x0=x0-f(x0)/df(x0);
end
zero=x0;