Arithemetic: 5, 10, 15, 20, 6, 8, 10, 12, First difference is constant, Graph is linear, , T n = a + (n - 1)d, , Quadratic: -1, 2, 9, 20 , 5, 20, 45, 80, Second difference is constant, Graph is u or n shape, , T n = an 2 + bn + c, ,

Arithmetic V Quadratic Sequences

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