Example 6.9. One entry in the following table is incorrect and y is a cubic polynomial in x. Use the difference table to locate and correct the error. 0 1 2 3 4. 5 6 7 y : 25 21 18 18 27 45 76 123 Example 6.9. One entry in the following table is incorrect and y is a cubic polynomial in x. Use the difference table to locate and correct the error. 0 1 2 3 4. 5 6 7 y : 25 21 18 18 27 45 76 123