5 and 6th term is 5120. Find the common ratio r of the geometric sequence with first term a = Assume r > 0.

College Algebra (MindTap Course List)
12th Edition
ISBN:9781305652231
Author:R. David Gustafson, Jeff Hughes
Publisher:R. David Gustafson, Jeff Hughes
Chapter8: Sequences, Series, And Probability
Section8.4: Geometric Sequences And Series
Problem 19E: Find the requested term of each geometric sequence. Find the fifth term of a geometric sequence...
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**Finding the Common Ratio of a Geometric Sequence**

In this exercise, we are asked to find the common ratio \( r \) of a geometric sequence. The given information includes:
- The first term \( a \) of the sequence is 5.
- The 6th term of the sequence is 5120.
- It is also given that we should assume \( r > 0 \).

To find the common ratio \( r \), we use the formula for the n-th term of a geometric sequence:

\[ a_n = a \cdot r^{(n-1)} \]

Plugging in the given values:
- \( a \) (first term) = 5
- \( a_6 \) (6th term) = 5120

Thus:
\[ 5120 = 5 \cdot r^{5} \]

To solve for \( r \), follow these steps:
1. Divide both sides of the equation by 5:
   \[ r^5 = \frac{5120}{5} \]
   \[ r^5 = 1024 \]

2. Take the 5th root of both sides:
   \[ r = \sqrt[5]{1024} \]

3. Calculate the 5th root:
   \[ r = 4 \]

Therefore, the common ratio \( r \) is \( 4 \).

**Interactive Example:**
- Solve for the common ratio \( r \)
- Input box: (for inputting the value of \( r \)).
Transcribed Image Text:**Finding the Common Ratio of a Geometric Sequence** In this exercise, we are asked to find the common ratio \( r \) of a geometric sequence. The given information includes: - The first term \( a \) of the sequence is 5. - The 6th term of the sequence is 5120. - It is also given that we should assume \( r > 0 \). To find the common ratio \( r \), we use the formula for the n-th term of a geometric sequence: \[ a_n = a \cdot r^{(n-1)} \] Plugging in the given values: - \( a \) (first term) = 5 - \( a_6 \) (6th term) = 5120 Thus: \[ 5120 = 5 \cdot r^{5} \] To solve for \( r \), follow these steps: 1. Divide both sides of the equation by 5: \[ r^5 = \frac{5120}{5} \] \[ r^5 = 1024 \] 2. Take the 5th root of both sides: \[ r = \sqrt[5]{1024} \] 3. Calculate the 5th root: \[ r = 4 \] Therefore, the common ratio \( r \) is \( 4 \). **Interactive Example:** - Solve for the common ratio \( r \) - Input box: (for inputting the value of \( r \)).
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