HP Prime Graphing Wireless Calculator Instrukcja Użytkownika Pobierz pdf (Strona 348)

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The HP Prime calculator does not alert you to the existence of multiple solutions. If you suspect that another

solution exists close to a particular value, repeat the exercise using that value as a seed. (In the example just

discussed, you will nd another solution if you enter –4 as the seed value for X.)

In some situations, the Solve app uses a random number seed in its search for a solution. This means that it is

not always predictable which seed leads to which solution when there are multiple solutions.

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 Reversal Solve found two points where the two sides of the equation have opposite signs, but it

cannot nd a point in between where the value is zero. Similarly, for an expression,

where the value of the expression has dierent signs but is not precisely zero. Either the

two values are neighbors (they dier 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

dierence 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: 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).

Cannot nd solution No values satisfy the selected equation or expression.

Bad Guess(es) The initial guess lies outside the domain of the equation. Therefore, the solution was not

a real number or it caused an error.

Constant? The value of the equation is the same at every point sampled.

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