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+clearglobal()
+clc;
+fx='x.^3+2*x.^2-x+5'
+dfx='3*x.^2+4*x-1'
+x0=2.5;
+x = x0; fa=eval(fx);
+tol=0.0000001
+while abs(fa)>tol
+x = x0; fa=eval(fx); dfa=eval(dfx)
+x1=x0-fa/dfa;
+ X = [x0,x1];
+ disp(X)
+ x0=x1
+ end; \ No newline at end of file