segundo grau 3.0

package javaapplication3;
import java.util.Scanner;
public class JavaApplication3 {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        double a, b, c, d;
        p("\nDigite o elemento A: ");
        l(a);
        p("\nDigite o elemento B: ");
        l(b);
        p("\nDigite o elemento C: ");
        l(c);
        p("\n====================\n");
        p(a + "x² + " + b + "x + " + c + " = 0\n");
        p("(-b ± Raiz(b² - 4 . a . c) ) / 2 . a\n");
        p("(-b ± Raiz(" + b + "² - 4 . " + a + " . " + c + ") ) / 2 . a\n");
        p("(-b ± Raiz(" + Math.pow(b,2) + " - " + 4 * a * c + ") ) / 2 . a\n");
        d = Math.pow(b,2) - 4 * a * c;
        if(d < 0){
            p("Raiz do delta não pertence aos Reais. (Raiz(" + d + ") != Reais)");
        }
        else
        {
            p("(-b ± Raiz(" + d + ") ) / 2 . a\n");
            p("(-b ± Raiz(" + d + ") ) / " + 2 * a + "\n");
            p("(" + i(b) + " ± Raiz(" + d + ") ) / " + 2 * a + "\n");
            p("    -------------------\n");
            p("    x1 = (" + i(b) + " + " + r(d) + ") ) / " + 2 * a + "\n");
            p("    x1 = (" + (i(b) + r(d)) + ") ) / " + 2 * a + "\n");
            p("    x1 = " + (i(b) + r(d)) / 2 * a + "\n");
            p("    -------------------\n");
            p("    x2 = (" + (i(b)) + " - " + r(d) + ") ) / " + 2 * a + "\n");
            p("    x2 = (" + (i(b) - r(d)) + ") ) / " + 2 * a + "\n");
            p("    x2 = " + (i(b) - r(d)) / 2 * a + "\n");
            p("    -------------------\n");
            p("Done!!");
        }
    }
    public static void p(String stri){
        System.out.print(stri);
    }
    public static double r(double n){
        return Math.sqrt(n);
    }
    public static double i(double n){
        return (n * -1);
    }
    public static void l(double n){
        n = input.nextInt();
    }
}