Метод парабол

public class Main {
    public static void main(String[] args) {
        double xOne = 1;
        double functionXOne = formula(xOne);
        double xTwo = 2;
        double functionXTwo = formula(xTwo);
        double xThree = 3;
        double functionXThree = formula(xThree);
        double delta = 0;
        double finaleE = 0.001;
        double aZero = 0;
        double aOne = 0;
        double aTwo = 0;
        double xLine = 0;
        int n = 1;
        do {
            aZero = functionXOne;
            aOne = (functionXTwo - functionXOne) / (xTwo - xOne);
            aTwo = (1 / (xThree - xTwo)) * (((functionXTwo - functionXOne) / (xThree - xOne)) - ((functionXTwo - functionXOne) / (xTwo - xOne)));
            xLine = (0.5) * (xOne + xTwo - (aOne / aTwo));
            delta = Math.abs(Math.pow(xLine, n) - Math.pow(xLine, n - 1));
            System.out.print("n: " + n + " ");
            System.out.print("x1: " + Math.round(xOne * 1000.0) / 1000.0 + " ");
            System.out.print("x2: " + Math.round(xTwo * 1000.0) / 1000.0 + " ");
            System.out.print("x3: " + Math.round(xThree * 1000.0) / 1000.0 + " ");
            System.out.print("x_: " + Math.round(xLine * 1000.0) / 1000.0 + " ");
            System.out.println("D: " + Math.round(delta * 1000.0) / 1000.0 + " ");
            n++;
            double functionLine = formula(xLine);
            xOne = xTwo;
            xTwo = xLine;
        } while (delta > finaleE);
    }

    public static double formula(double x) {
        double end_x;
        return end_x = 10 * Math.pow((3 - x), 4) + 5 * x * x;
    }
}