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Find an explicit formula for the arithmetic sequence

-11,-3,5,13,dots.
Note: the first term should be 
b(1).

b(n)=◻

Find an explicit formula for the arithmetic sequence\newline11,3,5,13, -11,-3,5,13, \ldots \text {. } \newlineNote: the first term should be b(1) b(1) .\newlineb(n)= b(n)=\square

Full solution

Q. Find an explicit formula for the arithmetic sequence\newline11,3,5,13, -11,-3,5,13, \ldots \text {. } \newlineNote: the first term should be b(1) b(1) .\newlineb(n)= b(n)=\square
  1. Identify Sequence Type: Identify whether the given sequence is geometric or arithmetic. The sequence 11,3,5,13,-11, -3, 5, 13, \ldots has a common difference between consecutive terms, so it is an arithmetic sequence.
  2. Find Common Difference: Determine the common difference dd of the sequence by subtracting any term from the term that follows it. For example, the difference between the second term 3-3 and the first term 11-11 is 3(11)=8-3 - (-11) = 8.
  3. Use Explicit Formula: Use the explicit formula for an arithmetic sequence, b(n)=b(1)+(n1)db(n) = b(1) + (n-1)d, where b(1)b(1) is the first term and dd is the common difference. For this sequence, the first term, b(1)b(1), is 11-11 and the common difference, dd, is 88.
  4. Substitute Values: Substitute the values of b(1)b(1) and dd into the formula to write an expression to describe the sequence. The expression for the sequence 11,3,5,13,-11, -3, 5, 13, \ldots is b(n)=11+(n1)×8b(n) = -11 + (n-1) \times 8.
  5. Simplify Expression: Simplify the expression by distributing the 88 into the parentheses: b(n)=11+8n8b(n) = -11 + 8n - 8.
  6. Combine Like Terms: Combine like terms to get the final explicit formula for the sequence: b(n)=8n19b(n) = 8n - 19.

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