Perhaps you're looking for something like this:

import java.util.Scanner;

public class Quadratic {

public static void main(String[] args) {

Scanner scan = new Scanner(System.in);

System.out.println("Quadratic Equation Solver");

System.out.println("y = A x^2 + B x + C");

System.out.print("Enter A, B, C "); // eg 1 5 6

double A = scan.nextDouble();

double B = scan.nextDouble();

double C = scan.nextDouble();

double Root1 = (-B - Math.sqrt(B*B - 4*A*C))/(2*A);

double Root2 = (-B + Math.sqrt(B*B - 4*A*C))/(2*A);

System.out.println("The roots are: " + Root1+", "+ Root2);

}//end main()

}//end class

Here is example that finds the of the quadratic equation:

http://www.javacodex.com/Math-Examples/Q...