Which of these creates a problem in Newton’s method for solving non-linear system of equations?

Which of these creates a problem in Newton’s method for solving non-linear system of equations? Correct Answer Jacobian

At each iteration of Newton’s method, Jacobian has to be evaluated for the method to be effective. Evaluation of the Jacobian with n2 elements at each step will be expensive. Moreover, a direct method of evaluating the Jacobian does not exist.
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