Sharp EL-9900 User Manual

Newton’s method is a technique of finding approximate solutions

to a math problem via calculus, when conventional algebraic

techniques just cannot work. If the Equation method fails, the

calculator will automatically switch to Newton’s method.

Solve “X

2

 

+

 4X 

–

 2 = 0”.

1. Enter SOLVER by pressing 

@ '. If you have items left

on the screen, clear the entries by pressing the 

C key

several times.

2. Enter “X

2

 

+

 4X 

–

 2”. When

the expression is entered as

a non-equation format, then

“=0” is automatically as-

sumed at the end. When

done, press 

E.

3. The next screen indicates

the variable “X” and its

previously set value. This

value will be assumed as the

starting point of the calcula-

tion segments, and the

Newton SOLVER will find the closest approximation to the

starting point. Enter “0”, and press 

E.

4. Now, press 

@ h to

execute the SOLVER. Since

this cannot be solved using

the Equation method, the

calculator automatically

switches analysis to

Newton’s method.

5. The next window confirms

the starting point of the

analysis (set to “X = 0” from

step #3), and the size of

each step (default is set to

“0.001”). Press 

@ h.