Polynomial help

Code:

# include <iostream>
using namespace std ;

class Polynomial
{
      private :
                int *array ;
                int x ;
      public  :
                Polynomial(int y=0 , int arr[]=0)
                {
                  x = y ;
                  array = new int [x+1] ; 
                }
                void  setPolynomial() ;
                void  setPolynomial(int*) ;
                int getPolynomial() ;
                 void operator =  (const Polynomial& ) ;
                 Polynomial operator *  (const Polynomial& ) ;
};
Polynomial Polynomial::operator *  (const Polynomial& p) 
{
   x = p.x ;
   int* arr = new int [x+1];
   for ( int i = 0 ; i < x+1 ; i++ )
   {
      arr[i] = array[i] * p.array[i] ;
   }
   Polynomial result(x);
   result.setPolynomial(arr);
   return result;
}

int main ()
{
    int  power ;
    char choice ;

    cout << "The Polynomial Function to the Power : " ;
    cin >> power ;

    int* poly1 ;
    Polynomial p1(power ,poly1);
    p1.setPolynomial() ;
    cout << "Enter Operator ( + , - , * , = , +=(1) , -=(2) , *=(3) ) : " ;
    cin  >> choice ;
    if ( choice == '*')
    {
         int* poly2 ;
         Polynomial p2(power ,poly2);
         p2.setPolynomial();

         Polynomial p3 ;
         p3 = p1 * p2 ;
         cout << endl ;
         p3.getPolynomial() ;
    }

    system("pause");
    return 0 ;
}

excuse me i want help
in the operator * it only multiply the cofficients but i want it to multiply in this form

(4x2 – 4x – 7)(x + 3)
= (4x2 – 4x – 7)(x) + (4x2 – 4x – 7)(3)
= 4x2(x) – 4x(x) – 7(x) + 4x2(3) – 4x(3) – 7(3)
= 4x3 – 4x2 – 7x + 12x2 – 12x – 21
= 4x3 – 4x2 + 12x2 – 7x – 12x – 21
= 4x3 + 8x2 – 19x – 21

can any one help me in this code plz