4. 18.9 Use Newton's interpolating polynomial to determine y at x = 3.5 to the best possible accuracy. Compute the finite divided differ- ences as in Fig. 18.5 and order your points to attain optimal accu- racy and convergence. 1 2.5 5.4375 7.3516 X Y O 2 3 4.5 5 7.5625 8.4453 9.1875 6 12

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