HP -225 Owner's Manual page 174

Scientific calculator
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SOLVE Equation: 18-INV{(X)>=8
Keys:
Display:
Description:
.005
X
Calculates x using
5 @(sOLVE]
X=0.1000
guesses .005 and 5.
B(asT) @(sHow]
P.OPPOERPBBAD
fix) = 0.
Watch what happens when you use negative values for guesses:
1 4] (s10] X
2
B(soLvE]
NO ROOT FND
-46,666,666,692.1
Displays last estimate
of x.
B(LAsT]
10.0000
f(x) for last estimate.
The graph illustrates that f(x) approaches 10 as x becomes a large neg-
ative number.
f(x)
4 10
>
f(x) = 10 — INV(x)
Example: A Math Error. Find the root of the equation:
v/
x
— — 5=0
x+ .3
166
B: More About Solving Equations

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