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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 normal mathematics, numbers begin at negative infinity, count up to zero, then continue on to positive infinity. This is not the case with temperatures since there is an absolute lower bound (absolute zero). In most materials most of the time, the absolute temperature scale just goes from zero to infinity.