Study the table. xy–28–12001228Which best describes the function represented by the data in the table?

Reading the table gives y-values 8, 2, 0, 2, and 8 as x increases by 1. The first differences are −6, −2, 2, and 6; their differences are all 4. A constant second difference indicates a quadratic function, so the data are quadratic with a common second difference of 4.

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