Solve quadratic equation

import java.util.Scanner;
import java.lang.Math;

public class QuadraticEquation {
    public static void main(String[] args) {
        double a, b, c, x1, x2;
        double delta;
        Scanner input = new Scanner(System.in);
        System.out.println("Enter operand a: ");
        a = input.nextFloat();
        System.out.println("Enter operand b: ");
        b = input.nextFloat();
        System.out.println("Enter operand c: ");
        c = input.nextFloat();

        if (a == 0) {
            if (b == 0) {
                if (c == 0) {
                    System.out.println("The equation has unlimited real roots.");
                } else {
                    System.out.println("The equation has no real roots. ");
                }
            } else {
                x1 = (-c) / b;
                System.out.println("The equation has one root x1 = x2 = " + x1 );
            }
        } else {
            delta = Math.pow(b, 2) - (4 * a * c);
            if (delta < 0) {
                System.out.println("The equation has no real roots");
            } else {
                if (delta == 0) {
                    x1 = -b / (2 * a);
                    System.out.println("The equation has one root x1 = x2 = " + x1 );
                } else {
                    if (delta > 0) {
                        x1 = (-b + Math.sqrt(delta)) / (2 * a);
                        x2 = (-b - Math.sqrt(delta)) / (2 * a);
                        System.out.println("The equation has two real roots: " );
                        System.out.println("X1 = " + x1);
                        System.out.println("X2 = " + x2);
                    }
                }
            }
        }
    }
}