Keep calm and licz delte!
∆=b²-4ac

https://www.youtube.com/watch?v=XexlbFkoPc0

➜ Silver 1 : ✔
➜ Silver 2 : ✔
➜ Silver 3 : ✔
➜ Silver 4 : ✔
➜ Silver Elite : ✔
➜ Silver Elite Master : ✔
➜ Gold Nova 1 : ✔
➜ Gold Nova 2 : ✔
➜ Gold Nova 3 : ✔
➜ Gold Nova Master : ✔
➜ Master Guardian 1 : ✔
➜ Master Guardian 2 : ✔
➜ Master Guardian Elite : ✔
➜ Distinguished Master Guardian : ✔
➜ Legendary Eagle : ✔
➜ Legendary Eagle Master : ✔
➜ Supreme Master First Class : ✖
➜ The Global Elite : ✖