Casio fx-991ES PLUS Manual De Usuario

E-21

  

0 

 1  2 

 

 

 

Current value of X

Input an initial value for X (Here, input 1): 

1 

 

To exit SOLVE: 

 

Solution screen

Note: During the time from when you press 

<(SOLVE) until you exit 

SOLVE by pressing 

, you should use Linear Display input procedures 

for input. 

Important:  • Depending on what you input for the initial value for X (solution 
variable), SOLVE may not be able to obtain solutions. If this happens, try 
changing the initial value so they are closer to the solution.  • SOLVE may not 
be able to determine the correct solution, even when one exists.  • SOLVE 
uses Newton’s Law, so even if there are multiple solutions, only one of them 
will be returned.  • Due to limitations in Newton’s Law, solutions tend to be 
difficult to obtain for equations like the following: 

 = sin(

), 

 = 

, 

 = 

'

. 

Solutions are always displayed in decimal format. 

 

 

Equation (The equation you input.)

 

Variable solved for 

 

Solution

 

 

 

(Left Side) – (Right Side) result

“(Left Side) – (Right Side) result” shows the result when the right side of the 
equation is subtracted from the left side, after assigning the obtained value 
to the variable being solved for. The closer this result is to zero, the higher 
the accuracy of the solution. 

SOLVE performs convergence a preset number of times. If it cannot find a 
solution, it displays a confirmation screen that shows “Continue: [=]”, asking 
if you want to continue.
Press 

 to continue or  to cancel the SOLVE operation.

 

To solve 

 = 

2

 – 

 + 1 for 

 when 

 = 3, 7, and 13 

 

                                  

 5(Y) <(=)

 

 

 (X)7 (X)  1  

 

 

<(SOLVE)