clc
clear

i = 0;
x = input('x: ');
err = 1;
acc = .0001;

f = @(x) (x^2 - 5);
df = @(x) (2 * x);
while err > acc
    xn = x - f(x) / df(x);
    err = abs(xn - x);
    x = xn
    i = i + 1
end