With this counter you can get the zeros of a function "ax² + bx + c" easily. Look at the second screenshot and you see hoe easy you can use this little app. By the way, you also can deduce functions or build the antiderivative. In case you any mistakes or bugs, please let me know in an E-Mail: bb-store@gmx. De. The mistakes and/or bugs will then be fixed in the next update.