Program help please!!!

i am suppossed to write a program to do the following "Using the ADT complex, write a program to determine the real roots of the quadratic equation, where a does not equal 0, after requesting the values of a, b, and c.

Note: The equation has 2 real roots if is positive, 1 real root if is zero, or 2 imaginary roots if is negative. The solutions are given by the quadratic formula:"

here is the class we are supposed to use or modify slightly to do this program.

class Complex { // complex number object
public:
Complex(); // default constructor
Complex( double, double ); // constructor that initializes real, imag
Complex( double ); // constructor that permits conversion
// from real to Complex
double getReal(); // accessor, returns the real part of a complex number object
double getImag(); // accessor , returns the imaginary part of a complex number
friend Complex operator + (const Complex &, const Complex &);
//overloads the + operator to allow complex number object + complex number object

friend Complex operator - (const Complex &, const Complex &);
//overloads the - operator to allow complex number object += complex number object

private:
double real; //the real part of a complex number object
double imag; //the imaginary part of a complex number object
friend istream & operator >> ( istream&, Complex& );
//overloads the >> operator to allow cin >> complex number object
friend ostream& operator << ( ostream&, const Complex& );
//overloads the << operator to allow cout << complex number object

};

i'm really confused at how to start this program, my teacher spent one class period teaching classes and abstract data types, i have a final on it on monday, i'm screwwed for that but i would like to get this program done.. any help would be greatly appreciated!!