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how can i change function to x^2-x-3 this matlab script

how can i change function to x^2-x-3 this matlab script

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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how can i change function to x^2-x-3 this matlab script  
 
 
format long
%exp(x) -3
%(0,2)
%initial value xr = 2 ;

 

 
x =0:0.01:2;
f = @(x)exp(x)-3;
figure;
plot(x,f(x))
grid on

 

 
%initial guess
xr = 2;

 

 
%fault tolerance
etol = 10^-5;
error = etol+ 1.0;
count = 0;

 

 
while error>=etol
f_xr = exp(xr)-3;
f_xr_der = exp(xr);
 
xr_new = xr - (f_xr/f_xr_der);
 
error = 100*abs((xr_new -xr)/xr_new);
xr = xr_new;
 
count = count+1;
 
fprintf('Iteration %d : xr = %.12f,percent_error =%.12f\n',count,xr,error);
 
end

 

 
disp(xr)
disp(count)
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