#include<stdio.h>
#include<math.h>
double problem()
{
		double x=1.0,x0,f,f1;
	do
	{
    x0=x;
	f=x0*x0*x0+2*x0*x0+3*x0+4;
	f1=3*x0*x0+4*x0+3;
	x=x0-f/f1;
	}while(fabs(x-x0)>=1e-5);
	printf("%f", x0);
}
void main()
{
	double m;
	m=problem();
}

-1.650638