Pregunta
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Describe the pattern, write the next term, and write a rule for the \( n \)th term of the sequence. \( 2,9,28,65, \ldots \) The pattern is The next term is The \( n \)th term is \( a_{n}= \)

Ask by Frazier Gross. in the United States
Mar 10,2025

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**Pattern:** Each term is the cube of its position plus 1. **Next Term:** 126 **Rule for the \( n \)th Term:** \( a_{n} = n^3 + 1 \)

Solución

**Step 1:** Recognize that each term in the sequence can be written as the cube of its position in the sequence plus 1. - For the 1st term: \( 1^3 + 1 = 1 + 1 = 2 \). - For the 2nd term: \( 2^3 + 1 = 8 + 1 = 9 \). - For the 3rd term: \( 3^3 + 1 = 27 + 1 = 28 \). - For the 4th term: \( 4^3 + 1 = 64 + 1 = 65 \). **Step 2:** The next term would be the 5th term. Compute it using the rule: \[ 5^3 + 1 = 125 + 1 = 126 \] **Step 3:** The rule for the \( n \)th term is: \[ a_n = n^3 + 1 \] Thus, the pattern is that each term is the cube of its index plus 1, the next term is 126, and the \( n \)th term is given by \( a_{n} = n^3 + 1 \).

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Beyond the Answer

To find the pattern, let's analyze the sequence: \( 2, 9, 28, 65, \ldots \). If we observe the differences between consecutive terms, we see \( 9 - 2 = 7 \), \( 28 - 9 = 19 \), and \( 65 - 28 = 37 \). The second differences are \( 19 - 7 = 12 \) and \( 37 - 19 = 18 \), suggesting the pattern may be formed by a cubic function. Thus, if we follow through with this calculation, the next term in the sequence after \( 65 \) would be \( 2^3 + 1^3 = 8 + 1 = 9 \), \( 3^3 + 0 = 27 +1 = 28 \), and so on. The next term is \( 126 \). For the \( n \)th term, it can be expressed as \( a_n = n^3 + n \). So, the complete answer is: The pattern is cubic growth. The next term is \( 126 \). The \( n \)th term is \( a_{n} = n^3 + n \).

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