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Full Answer. A double root can be confirmed mathematically by examining the equation for solving a second-degree polynomial. If the discriminant, or square root of b^2-4*a*c, is equal to zero, then the equation has a double root. Finishing calculating the solution of the equation will yield two answers of the exact same magnitude.
In the above, 1  The main method calls getANumber() to get a double value, and assigns this value to number1. 2  The main method calls getANumber() a second time to get another double value, and assigns this value to number2. 3  The main method calls average(number1, number2) to compute the average of the two numbers.