Identify the pattern in the following sequence and write an algebraic expression for the nth term: 2,5,8,11,14…

Mathematics

ScanSolve AI Answer

Answer

3n - 1

Step-by-step solution

5 steps

To identify the pattern and write an algebraic expression for the nn-th term of the sequence 2,5,8,11,14,…2, 5, 8, 11, 14, \dots, we first need to determine if it's an arithmetic or geometric sequence.

  1. Find the difference between consecutive terms.

    5−2=35 - 2 = 3 8−5=38 - 5 = 3 11−8=311 - 8 = 3 14−11=314 - 11 = 3

    Since the difference between consecutive terms is constant, this is an arithmetic sequence with a common difference d=3d=3.

  2. Identify the first term.

    The first term of the sequence, denoted as a1a_1, is 2.

  3. Use the formula for the nn-th term of an arithmetic sequence.

    The formula for the nn-th term (ana_n) of an arithmetic sequence is given by:

    an=a1+(n−1)da_n = a_1 + (n-1)d

    where a1a_1 is the first term, nn is the term number, and dd is the common difference.

  4. Substitute the values of a1a_1 and dd into the formula.

    Substitute a1=2a_1 = 2 and d=3d = 3:

    an=2+(n−1)3a_n = 2 + (n-1)3
  5. Simplify the expression.

    Distribute the 3:

    an=2+3n−3a_n = 2 + 3n - 3

    Combine the constant terms:

    an=3n−1a_n = 3n - 1

    The algebraic expression for the nn-th term is 3n−1\boxed{3n - 1}.

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