static int KvadrFunc(double A, double B, double *X)
{
	double D = pow2(A,2) - 4*B;
	if (D < 0)
		return 0;
		
	if (D == 0)
	{
		X[0] = -A/2;
		X[1] = -A/2;
		return 1;
	}
	
	X[0] = (-A + sqrt(D)) / 2;
	X[1] = (-A - sqrt(D)) / 2;
	return 2;
}