HP 40G manual Interpreting results, Message Condition

Interpreting results

After Solve has returned a solution, press ,1)2ain the Numeric view for more information. You will see one of the following three messages. Press 2.ato clear the message.

Message	Condition
Zero	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.
Sign Reversal	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.
Extremum	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