1 9.2 Arithmetic Sequences How can you write a rule (formula/equation) for an arithmetic sequence? Key Vocabulary Arithmetic sequence A sequence in which the difference between consecutive terms is a constant. Common difference The value of the difference in arithmetic sequences. EXAMPLE 1 Identify arithmetic sequences Tell whether the sequence is arithmetic and give the common difference a. –4, 1, 6, 11, 16, . . . b. 3, 5, 9, 15, 23, . . . Equations for Arithmetic Sequences a n =a 1 + (n – 1)d a n : nth term a 1 : 1 st term d: common difference
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Key Vocabulary 9.2 Arithmetic Sequences A sequence in ...
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