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Find an explicit formula for the arithmetic sequence

37,74,111,148,dots
Note: the first term should be 
a(1).

a(n)=

Find an explicit formula for the arithmetic sequence\newline37,74,111,148, 37,74,111,148, \ldots \newlineNote: the first term should be a(1) a(1) .\newline a(n) = \(\square\)

Full solution

Q. Find an explicit formula for the arithmetic sequence\newline37,74,111,148, 37,74,111,148, \ldots \newlineNote: the first term should be a(1) a(1) .\newline a(n) = \(\square\)
  1. Identify Type of Sequence: Identify whether the given sequence is geometric or arithmetic. The sequence 37,74,111,148,37, 74, 111, 148, \ldots has a common difference between consecutive terms, so it is an arithmetic sequence.
  2. Find First Term and Common Difference: Determine the first term (a1a_1) and the common difference (dd) of the sequence. The first term a1a_1 is 3737. To find the common difference, subtract the first term from the second term: d=7437=37d = 74 - 37 = 37.
  3. Apply Explicit Formula: Use the explicit formula for an arithmetic sequence, an=a1+(n1)da_n = a_1 + (n-1)d, where a1a_1 is the first term and dd is the common difference. Substitute the values of a1a_1 and dd into the formula. The expression for the sequence is an=37+(n1)×37a_n = 37 + (n-1) \times 37.
  4. Simplify Expression: Simplify the expression by distributing the 3737 inside the parentheses. an=37+37n37a_n = 37 + 37n - 37. Combine like terms to get the final expression.
  5. Final Explicit Formula: After combining like terms, the final expression is an=37na_n = 37n. This is the explicit formula for the given arithmetic sequence.

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