When Solve Cannot Find A Root - HP 33s User Manual

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Now, solve to find the root.
Keys:
e
2.3
X
2.7
º d
Û
X
< <

When SOLVE Cannot Find a 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.
The search halts because SOLVE is working on a horizontal asymptote—an
area where f(x) is essentially constant for a wide range of x (see figure b,
below). The ending value of f(x) is the value of the potential asymptote.
The search is concentrated in a local "flat" region of the function (see figure c,
below). The ending value of f(x) is the value of the function in this region.
D–8
More about Solving
Display:
 _ 


 f(x) is relatively large.
Description:
Your initial guesses for the
root.
Selects Equation mode;
displays the equation.
No root found for f(x) .

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