Untitled

#include <iostream>
using namespace std;
int main()
{
   {
    float a,b,c,d,x1,x2;
    cin >> a >> b >> c;

    d = b*b - 4*a*c;

    if(d < 0) cout << "Vo nghiem";
    else if(d == 0)
        cout << "x = " << -b/(2*a);
    else
    {
        x1 = (-b + sqrt(d))/(2*a);
        x2 = (-b - sqrt(d))/(2*a);

        cout << "x1 = " << x1 << endl;
        cout << "x2 = " << x2;
    }

    return 0;
   }
}