%0 Journal Article %T A family of optimal iterative methods with fifth and tenth order convergence for solving nonlinear equations %A Mashallah Matinfar %A Mohammad Aminzadeh %J Journal of Interpolation and Approximation in Scientific Computing %D 2012 %I International Scientific Publications and Consulting Services (ISPACS) %R 10.5899/2012/jiasc-00012 %X In this paper, we propose a two-step method with fifth-order convergence and a family of optimal three-step method with tenth-order convergence for finding the simple roots of nonlinear equations. The optimal efficiency indices are all found to be $5^{frac{1}{3}}approx1.71$ and $10^{frac{1}{4}}approx1.78.$ Some numerical examples illustrate that the algorithms are more efficient and performs better than other methods. %K Nonlinear equation %K Iterative method %K Three-step %K Convergence order %K Efficiency index %U http://www.ispacs.com/journals/jiasc/2012/jiasc-00012/article.pdf