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

 

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

 

difference between the two sides of

 

the equation has 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. 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 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 value returned is

 

probably not valid.

 

 

7-6

Solve aplet