Math Problem Statement

The start of an arithmetic sequence is shown below. What is the nth term rule for this sequence? 2 → 8 → 14 → 20 → 26 → ...

Solution

To find the nthn^{\text{th}} term of this arithmetic sequence, we need the following steps:

Step 1: Identify the common difference (dd)

The terms are: 2,8,14,20,26,2, 8, 14, 20, 26, \ldots

The difference between consecutive terms is: d=82=6d = 8 - 2 = 6

This is the common difference.

Step 2: Find the first term (aa)

The first term is: a=2a = 2

Step 3: General formula for the nthn^{\text{th}} term

The formula for the nthn^{\text{th}} term of an arithmetic sequence is: Tn=a+(n1)dT_n = a + (n-1) \cdot d

Substitute a=2a = 2 and d=6d = 6: Tn=2+(n1)6T_n = 2 + (n-1) \cdot 6

Simplify: Tn=2+6n6T_n = 2 + 6n - 6 Tn=6n4T_n = 6n - 4

Final Answer:

The nthn^{\text{th}} term rule is: Tn=6n4T_n = 6n - 4


Would you like me to explain any part of this further or provide examples?


Related Questions:

  1. How do you derive the nthn^{\text{th}} term rule for a geometric sequence?
  2. What is the difference between an arithmetic and geometric sequence?
  3. How can you calculate the sum of the first nn terms in an arithmetic sequence?
  4. What happens if the common difference (dd) is negative in an arithmetic sequence?
  5. How would you find the term number (nn) for a given value in an arithmetic sequence?

Tip:

To confirm your nthn^{\text{th}} term rule, substitute values of nn (e.g., n=1,2,3n=1, 2, 3) and check if they match the sequence terms.

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Math Problem Analysis

Mathematical Concepts

Arithmetic Sequences
Linear Relationships
Algebra

Formulas

T_n = a + (n-1) * d

Theorems

Arithmetic sequence nth term formula

Suitable Grade Level

Grades 7-9