Thus, although they produce the
correct result, they are somewhat inefficient. This would not be important for a single application,
but could become prohibitive if many evaluations were made.
We could try to attain improved performance by turning to an open method. Because
Eq. (8.21) is relatively straightforward to differentiate, the Newton-Raphson method is
a good candidate. For example, using an initial guess at the lower end of the range
(x0 = 0.008), Newton-Raphson converges quickly to 0.0289678 with an approximate error
of 6.87 × 10–6% in only 6 iterations. However, when the initial guess is set at the upper end
of the range (x0 = 0.08), the routine diverge