Math Problem Statement

find the 11th term of geometric sequence -17,-17,-17

Solution

To find the 11th term of a geometric sequence, we use the formula for the nth term of a geometric sequence:

an=a1r(n1)a_n = a_1 \cdot r^{(n-1)}

Where:

  • ana_n is the nth term.
  • a1a_1 is the first term.
  • rr is the common ratio.
  • nn is the term number.

In the sequence 17,17,17,-17, -17, -17, \dots, we observe that all terms are identical. This implies that the common ratio (rr) is 1, as each term is multiplied by 1 to get the next term.

Thus, the formula simplifies to:

a11=171(111)=171=17a_{11} = -17 \cdot 1^{(11-1)} = -17 \cdot 1 = -17

So, the 11th term is 17-17.

Would you like further explanation or have any other questions?

Here are 5 related questions to expand your understanding:

  1. How do you find the common ratio in a geometric sequence?
  2. What happens if the common ratio in a geometric sequence is negative?
  3. How do you find the sum of the first n terms of a geometric sequence?
  4. What is the formula for the sum of an infinite geometric series?
  5. How do you differentiate between an arithmetic and a geometric sequence?

Tip: In a geometric sequence, if all terms are identical, the common ratio is always 1.

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Math Problem Analysis

Mathematical Concepts

Geometric Sequences
Common Ratio
Exponential Growth

Formulas

nth term of a geometric sequence: a_n = a_1 * r^(n-1)

Theorems

Geometric Sequence Theorem (constant ratio theorem)

Suitable Grade Level

Grades 8-10