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HP -22S Owner's Manual Page 166

Scientific calculator.
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SOLVE Equation: 10- I NV (X) =0
Keys:
.005
(§!Q]
X
5.1
SOLVE
I
.1
LAST
I
.1
SHOW
I
Display:
X=0.1000
0.00000000000
Description:
Calculates
x
using
guesses .005 and 5.
[(x)
= O.
Watch what happens when you use negative values for guesses:
1
ElJ
(§!Q]
X
2
ElJ .,
SOLVE
I
@]
• , LAST
I
NO ROOT FND
.-
-46,666,666,692.1
10.0000
Displays last estimate
of
x .
[(x)
for last estimate.
The graph illustrates that
[(x)
approaches 10 as
x
becomes a large neg-
ative number.
f(x)
)
10
x
-2
-1
1
2
3
f(x)
=
10 - INV(x)
Example: A Math Error.
Find the root of the equation:
V
x:
.3 -.5
=
0
166
B: More About Solving Equations

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