This research aims to build the application in the calculation of the roots of an equation with a half-break and methodology methodology to place errors on the operating system Android. Useful for students and general users, which allows to calculate the square root of the equation is easy and convenient for users. A tool used in the design, development and application program Development Software such as Eclipse and Android Kit (Android SDK), and the language used is Java development research applications that have been validated in accordance with the theory of the roots with a half-break and methodology methodology the rest wrong decimal precision, and with 19 positions.
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