Math Problem Statement

If a_1 is 36 and the common difference is -7 what’s the general formula

Solution

The problem gives the first term a1=36a_1 = 36 and the common difference d=7d = -7 for an arithmetic sequence.

The general formula for the nn-th term of an arithmetic sequence is:

an=a1+(n1)da_n = a_1 + (n - 1) \cdot d

Substituting the given values a1=36a_1 = 36 and d=7d = -7, we get:

an=36+(n1)(7)a_n = 36 + (n - 1) \cdot (-7)

Simplifying:

an=367(n1)a_n = 36 - 7(n - 1) an=367n+7a_n = 36 - 7n + 7 an=437na_n = 43 - 7n

Thus, the general formula for the arithmetic sequence is:

an=437na_n = 43 - 7n

Would you like more details or have any questions?

Here are 5 related questions:

  1. How do you find the sum of the first nn terms of this sequence?
  2. What is the 10th term of the sequence?
  3. How do you identify whether a number is part of this arithmetic sequence?
  4. How does the sequence behave as nn increases?
  5. How would the formula change if the common difference were positive?

Tip: In arithmetic sequences, each term differs from the previous one by a constant value called the common difference.

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Math Problem Analysis

Mathematical Concepts

Arithmetic Sequences
Linear Equations

Formulas

a_n = a_1 + (n - 1) * d

Theorems

Arithmetic Sequence General Formula

Suitable Grade Level

Grades 7-9