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

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