HP Prime Graphing NW280AAABA manual Solution information, Zero, Sign, Reversal

Solution information

When you are solving a single equation, the button

appears on the menu after you tap . Tapping displays a message giving you some information about the

solutions found (if any). Tap to clear the message.

Message	Meaning
Zero	The Solve app found a point where both
	sides of the equation were equal, or where
	the expression was zero (a root), within the
	calculator's 12-digit accuracy.
Sign	Solve found two points where the two sides
Reversal	of the equation have opposite signs, but it
	cannot find a point in between where the
	value is zero. Similarly, for an expression,
	where the value of the expression has
	different signs but is not precisely zero.
	Either the two values are neighbors (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 or difference is closer to zero. If the
	equation or expression is continuously real,
	this point is Solve’s best approximation of
	an actual solution.
Extremum	Solve found a point where the value of the
	expression approximates a local minimum
	(for positive values) or maximum (for
	negative values). This point may or may not
	be a solution.
	Or:
	Solve stopped searching at
	9.99999999999E499, the largest number
	the calculator can represent.
	Note that the Extremum message indicates
	that it is highly likely that there is no
	solution. Use Numeric view to verify this
	(and note that any values shown are
	suspect).

Solve app 265