A Class of Three-Step Derivative-Free Root Solvers with Optimal Convergence Order

Table 1

Comparison of efficiency indices for different derivative-free methods.

Methods	Steffensen	(1.1)	(1.2)	(1.3)	(1.4)	(2.6)	(2.16)
Efficiency indices	1.414	1.587	1.587	1.587	1.565	1.682	1.682