Sharp EL-9900 operation manual Newton’s

Chapter 12: The SOLVER Feature

Newton’s	Newton’s method is a technique of finding approximate solutions
method	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.
	Example
	Solve “X2 + 4X – 2 = 0”.
	1. Enter SOLVER by pressing @'. If you have items left
	on the screen, clear the entries by pressing the Ckey
	several times.
	2. Enter “X2 + 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 @hto
	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.

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