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#include<stdio.h>
#include<math.h>
float f (float x)
{
 return(pow(x,2)-2*x-3);
}

int main()
{
	float a,b,x,error;
	int i=0;
	
	printf("Enter allowed error");
	scanf("%f",&error);
	
	printf("Enter a and b");
	scanf("%f %f",&a,&b);
	
	do                                                                                                                                                 
	{
		++i;
		x=(a*f(b)-b*f(a))/f(b)-f(a);
		
		printf("%d=%f\n",i,x);
	}
		while(fabs(f(x))>error);
		printf("\nRoot=%f",x);
	return 0;
}
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