where the question marks are at how would I find what 'xr' and 'iter' are?

and on the graph below how do I solve for Xnew?

2. Newton-Raphson method by a user-defined MATLAB function Type in the following code, fill in the blank, and create a function m-file named newtraph.m. function [root, ea, iter] newtraph (func, dfunc, xr, es, maxit) % newtraph : Newton-Raphson root finding method % [root, ea, iter] newtraph (func, dfunc, xr, es, maxit) % input: 8 func name of function % dfunc name of derivative of function 8 xrinitial guess % es desired relative error (default 0.0001%) % maxit= maximum allowable iterations (default=20) % output: rootreal root ea = approximate relative error (%) iter = number of iterations % a text file 'newt raph-out.txt' is generated to store iterations if nargin