Code Example 1

``````using System;

using System.Collections.Generic;

using System.Text;

namespace SoftwareAndFinance

{

class Math

{

// quadratic equation is a second order of polynomial       equation in       a single variable

// x = [ -b +/- sqrt(b^2 - 4ac) ] / 2a

public static void SolveQuadratic(double a, double b, double c)

{

double sqrtpart = b * b - 4 * a * c;

double x, x1, x2, img;

if (sqrtpart > 0)

{

x1 = (-b + System.Math.Sqrt(sqrtpart)) / (2 * a);

x2 = (-b - System.Math.Sqrt(sqrtpart)) / (2 * a);

Console.WriteLine("Two Real Solutions: {0,8:f4} or  {1,8:f4}", x1, x2);

}

else if (sqrtpart < 0)

{

sqrtpart = -sqrtpart;

x = -b / (2 * a);

img = System.Math.Sqrt(sqrtpart) / (2 * a);

Console.WriteLine("Two Imaginary Solutions: {0,8:f4} + {1,8:f4} i or {2,8:f4} + {3,8:f4} i", x, img, x, img);

}

else

{

x = (-b + System.Math.Sqrt(sqrtpart)) / (2 * a);

Console.WriteLine("One Real Solution: {0,8:f4}", x);

}

}

static void Main(string[] args)

{

// 6x^2 + 11x - 35 = 0

// 5x^2 + 6x + 1 = 0

// 2x^2 + 4x + 2 = 0

// 5x^2 + 2x + 1 = 0