Second degree equation solver with Arduino

This instuctable is about making sort of a calculator that enables the user by using an analog 12-digit keyboard and 4 buttons to input the a,b,c variables into a equation and get the solution for it if there is any.(well if u don't know what an second grade equation is probably u haven't been in high school, even though you can follow this post to learn about microcontrollers.) It can be a great electronic ...

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