The app solves and calculates any quadratic equation that you have in mind. It shows the steps of the solution so you'll understand the calculation, as well as showing you the function graph where you can see the coordinates clearly (Graph Display - for quadratic as well as Linear equations).
Additionally, you can see the equations which you calculated through the app in the past and if you forget the formula of solving quadratic equations, you can always find it in the app's Help section.
[This app is a masterpiece made by YT Android Apps].