If we wish to find a root correct to six decimal places, say, we use Formula 2 for n = 1, 2, 3, ... and we stop when successive approximation Xn and Xn+1 agree to six decimal places.

The procedure in going from stage n to stage n + 1 is the same for all values of n, and we call Formula 2 a RECURSION FORMULA. As a result, it is especially convenient to use a computer or a programmable calculator when using Newton's Method.