#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;

void solve(ld a, ld b, ld c)
{
    // 判別式
    ld D = b*b - 4.0L*a*c;
    cout << fixed << setprecision(10);
    if(a==0 && b == 0 && c==0)
    {
        cout << "3\n";
    }
    else if((a==0 && b==0) || D<0)
    {
        cout << "0\n";
    }
    else if(a==0)
    {
        // x = -c/b | a==0
        cout << "1 " << -c/b << '\n';
    }
    else if(D==0)
    {
        // x = -b / 2a
        cout << "1 " << -b/(2.0L*a) << '\n';
    }
    else
    {
        ld x1 = (-b + sqrt(D)) / (2.0L * a);
        ld x2 = (-b - sqrt(D)) / (2.0L * a);
        cout << "2 " << min(x1, x2) << ' ' << max(x1, x2) << '\n';
    }
    
    return;
}

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    int T;
    cin >> T;
    for(int i=0; i<T; i++)
    {
        int a, b, c;
        cin >> a >> b >> c;
        solve(a, b, c);
    }

    return 0;
}