text:  #include<stdio.h>
    #include<conio.h>
    #include<math.h>
    #define ESP 0.0001
    #define F(x) x*x - 4*x - 10
    void main()
    {
    float x1,x2,x3,f1,f2,t;
    clrscr();
    printf("\nEnter the value of x1: ");
    scanf("%f",&x1);
    printf("\nEnter the value of x2: ");
    scanf("%f",&x2);
    printf("\n________________________________________\n");
    printf("\n x1\t x2\t x3\t f(x1)\t f(x2)");
    printf("\n______________________________________________\n");
        do
        {
        f1=F(x1);
        f2=F(x2);
        x3=x2-((f2*(x2-x1))/(f2-f1));
        printf("\n%f %f %f %f %f",x1,x2,x3,f1,f2);
        x1=x2;
        x2=x3;
        if(f2<0)
        {
        t=fabs(f2);
        }
        else
        {
        t=f2;
        }
        }
    while(t>ESP);
    printf("\n______________________________________________\n");
    printf("\n\nApp.root = %f",x3);
    getch();
    }
  
  