f(x)=x^5-87;
df(x)=diff(f(x));
x0=2;
e=(1/2)*(10^(-5));
[x1,k]=newton(x0,e) function [x1,k]=newton(x0,e)
n=100;
k=1;
y=f(x0);
dy=df(x0);
x1=x0-y/dy;
while abs(x1-x0)>=e x0=x1; y=f(x0); dy=df(x0); x1=x0-y/dy; k=k+1; if k==n break end
end
end


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