This free app for Android contains quadratic equations and solutions.

The main screen displays the equations you need to solve. You will be able to see the initial values and the step-by-step solution.

The main menu of the application contains an option for choosing between solving by completing the square or by quadratic formula.

In solving by completing the square, you have to choose the value of the sum of the squared terms. You can use the quadratic formula to solve quadratic equations, but with some exceptions.

It is not possible to use this app to solve algebraic equations with only one variable.