A problem in the middle of ... !

Hi everyone, I was solving a problem about analysing solutions of quadratic equation, and of corse calculating the solutions. But when I enter the coefficients of equation 2,4,2 ,actually always when first one is bigger than one the results are incorrect. Here is the code:

Code:

 #include<iostream>
#include<cmath>
using namespace std;
int main(){
    double a,b,c;
    cout<<"Enter a :  ";
    cin>>a;
    cin.ignore(1000,'\n');
    cout<<"Enter b: ";
    cin>>b;
    cin.ignore(1000,'\n');
    cout<<"Enter c : ";
    cin>>c;
    double d=b*b-4*a*c;
            if(d>=0){
            double x1=((-b+sqrt(d))/2*a);
            double x2=((-b-sqrt(d))/2*a);
            cout<<"x1="<<x1<<" "<<"x2="<<x2<<endl;
        }
        else{
            d=-d;
            double re=-b/2*a;
            double im=sqrt(d)/2*a;
            cout<<"x1="<<"("<<re<<","<<im<<")"<<" "<<"x2="<<"("<<re<<","<<-im<<")"<<endl;
        }

    return 0;
}

Can you copy/paste your console session, showing what you type in and what gets printed?

Code:

(-b-sqrt(d))/(2*a)

Thank you very, very much for your answer ! A small detail, that i didn't notice at all !