2.8 A

  
import java.util.*; //Allows use of Scanner

public class SolveQuadratic
{
    public static void main(String args[]) 
    {
        int a, b, c; //ax^2 + bx + c
        double discriminant; // b^2 - 4ac
        double root1, root2; // root1 for add, root2 for subtract
        Scanner keyboard = new Scanner(System.in); // Creates an object for inputs
        
        System.out.print ("Enter the coefficient of x^2: " );
        a = keyboard.nextInt();
        
        System.out.print ("Enter the coefficient of x: ");
        b = keyboard.nextInt();
        
        System.out.print ("Enter the constant: ");
        c = keyboard.nextInt();
        
        //use the quadratic formula to compute the roots
        //assumes a positive discriminant
        
        discriminant = Math.pow(b,2) - (4 * a * c);
        root1 = ((-1 * b) + Math.sqrt(discriminant)) / (2 * a);
        root2 = ((-1 * b) - Math.sqrt(discriminant)) / (2 * a);
        
        System.out.println ("Root #1: " + root1);
        System.out.println ("Root #2: " + root2);
    } //end main
} //end class