#include <iostream>
#include <math.h>
using namespace std;
int main (){
    int a,b,c;
    cout << " nhap so a = ";cin>>a;
    cout<< " nhap so b = ";cin>>b;
    cout << " nhap so c = ";cin>>c;
    int (denta) = b*b - 4*a*c ;
    if (denta > 0){
        cout << "phuong trinh co nghiem x1 = "<< (-b+sqrt(denta))/2*a;
        cout << "phuong trinh co nghiem x2 = "<< (-b-sqrt(denta))/2*a;
    }
    else if (denta = 0){
        cout<< " phuong trinh co nghiem kep x1 = x2 = "<<(-b)/2*a;
    }
    else
    cout << "phuong trinh vo nghiem" ;
    return (0);

}