Math Problem Statement

what is the 6th term of 3,-6,12,-24

Solution

To find the 6th term of the sequence 3,6,12,24,3, -6, 12, -24, \dots, we can recognize this as a geometric sequence.

Step 1: Identify the first term and common ratio

  • First term (a1a_1): 33
  • Common ratio (rr): To find rr, divide the second term by the first term: r=63=2r = \frac{-6}{3} = -2

Step 2: Find the 6th term

The general formula for the nnth term of a geometric sequence is: an=a1×rn1a_n = a_1 \times r^{n-1} For the 6th term (a6a_6): a6=3×(2)61=3×(2)5a_6 = 3 \times (-2)^{6-1} = 3 \times (-2)^5 a6=3×(32)=96a_6 = 3 \times (-32) = -96

Answer:

The 6th term of the sequence is -96.

Would you like further details or have any questions? Here are some related questions you might find interesting:

  1. How does the sign of the common ratio affect the sequence?
  2. What is the sum of the first 6 terms of this geometric sequence?
  3. How would you find the nnth term if the sequence alternated differently?
  4. What happens to the sequence if the common ratio is fractional?
  5. Can a geometric sequence have a common ratio that is a complex number?

Tip: Pay close attention to the sign of the common ratio, as it determines whether the sequence alternates between positive and negative terms.

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Math Problem Analysis

Mathematical Concepts

Geometric Sequences

Formulas

General formula for the nth term of a geometric sequence

Theorems

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Suitable Grade Level

Grades 9-12