HP 32SII, Руководство пользователя

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C–8 More about Solving
File name 32sii-Manual-E-0424
Printed Date : 2003/4/24 Size : 17.7 x 25.2 cm
K X p
{ \ K X
0
2
„
6
{ ] „
1
š
%ª1%:. 22.
Enters the equation.
{ 
/ )
Checksum and length.
† Cancels Equation mode.
Now, solve to find the root.
Keys: Display: Description:
2.3
H
X 2.7
) _
Your initial guesses for the root.
{ G
%ª1%:. 22.
Selects Equation mode; displays
the equation.
{ œ
X
#
%/)
Calculates the root using guesses
that bracket
6
.
9 9
8 8 8)
f(x) is relatively large.
There is a pole between the final estimates. The initial guesses yielded
opposite signs for
f(x) , and the interval between successive estimates was
narrowed until two neighbors were found. Unfortunately, these neighbors
made
f(x) approach a pole instead of the x –axis. The function does have roots
at –2 and 3, which can be found by entering better guesses.
When SOLVE Cannot Find Root
Sometimes SOLVE fails to find a root. The following conditions cause the
message
!
:
The search terminates near a local minimum or maximum (see figure a,
below). If the ending value of f(x) (stored in the Z–register) is relatively
close to zero, it is possible that a root has been found; the number stored
in the unknown variable might be a 12–digit number very close to a
theoretical root.