//Secant Method for finding the roots of an equation
#include<iostream>
#include<iomanip>
#include<cmath>
using namespace std;
double f(double x); //declare the function for the given equation
double f(double x) //define the function here, ie give the equation
{
double a=pow(x,3)-x-11.0; //write the equation whose roots are to be determined
return a;
}
int main()
{
cout.precision(4);
cout.setf(ios::fixed); //set the precision of the output
double a,b,c,e;
cout<<"Enter the initial guess\na=";
cin>>b;
cout<<"b=\n"; //take an intial guess
cin>>c;
cout<<"Enter the degree of accuracy\n";
cin>>e; //take the desired accuracy
do
{
a=b;
b=c; //make b equal to the last calculated value of c
c=b-(b-a)/(f(b)-f(a))*f(b); //calculate c
if (f(c)==0)
{
cout<<"\nThe root of the equation is "<<c; //print the root
return 0;
}
}while(abs(c-b)>=e); //check if the error is greater than the desired accuracy
cout<<"\nThe root of the equation is "<<c; //print the root
return 0;
}

Ph.D. researcher at Friedrich-Schiller University Jena, Germany. I’m a physicist specializing in computational material science. I write efficient codes for simulating light-matter interactions at atomic scales. I like to develop Physics, DFT, and Machine Learning related apps and software from time to time. Can code in most of the popular languages. I like to share my knowledge in Physics and applications using this Blog and a YouTube channel.

how can i get PDF including some of this numerical problem with solution??

the code given is differebt from the one used in the video