Steffensen (Eitken-Steffensen) method for solving nonlinear equations

Solving nonlinear equations is more complicated and is a perfectly unresolved problem in computational mathematics. This iterative algorithm is called the Steffensen method in numerical methods. The Steffensen method has a quadratic approximation. This method requires calculating the value of the function twice in each iteration, in which case the Steffensen method is less efficient than the cutters method