222 Appendix D: A Detailed Look at _
concave everywhere.
The only local minima and
maxima of the function’
graph occur singly between
function.
In addition, it is assumed that the _ algorithm will not be
interrupted by an improper operation.
Accuracy of the Root
When you use the _ key to find a root of an equation, the root is
found accurately. The displayed root either gives a calculated function
value (f (x)) exactly equal to zero or else is a 10-digit number virtually
adjacent to the place where the function’s graph crosses the x-axis. Any
such root has an accuracy within two or three units in the 10th significant
digit.
In most situations the calculated root is an accurate estimate of the
theoretical (infinitely precise) root of the equation. However, certain
conditions can cause the finite accuracy of the calculator to give a result
that appears to be inconsistent with your theoretical expectation.
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