HP hp39gPlus User Guide - Page 90
Interpreting results
UPC - 829160013138
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Interpreting results After Solve has returned a solution, press in the Numeric view for more information. You will see one of the following three messages. Press to clear the message. Message Zero Sign Reversal Extremum Condition The Solve aplet found a point where the value of the equation (or the root of the expression) is zero within the calculator's 12-digit accuracy. Solve found two points where the value of the equation has opposite signs, but it cannot find a point in between where the value is zero. This might be because either the two points are neighbours (they differ by one in the twelfth digit), or the equation is not real-valued between the two points. Solve returns the point where the value is closer to zero. If the value of the equation is a continuous real function, this point is Solve's best approximation of an actual root. Solve found a point where the value of the equation approximates a local minimum (for positive values) or maximum (for negative values). This point may or may not be a root. Or: Solve stopped searching at 9.99999999999E499, the largest number the calculator can represent. 7-6 Solve aplet
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