Solve the recurrence relation an+1 = 7an – 1Oan-1,n > 2, given a1 = 10, a2 = 29.
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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![### Solving a Recurrence Relation
**Problem Statement:**
Solve the recurrence relation \(a_{n+1} = 7a_n - 10a_{n-1}\), for \( n \geq 2 \), given the initial conditions \(a_1 = 10\) and \(a_2 = 29\).
**Solution Approach:**
To solve this recurrence relation, we can use characteristic equations:
1. **Form the Characteristic Equation:**
\[
r^2 = 7r - 10
\]
Rearrange to get:
\[
r^2 - 7r + 10 = 0
\]
2. **Solve the Characteristic Equation:**
Factorize the quadratic equation:
\[
(r - 5)(r - 2) = 0
\]
Thus, the roots are:
\[
r_1 = 5, \quad r_2 = 2
\]
3. **General Solution:**
Using the roots, the general solution for the recurrence relation is:
\[
a_n = A \cdot 5^n + B \cdot 2^n
\]
4. **Find Constants \(A\) and \(B\):**
Use the initial conditions to form a system of equations:
\[
\begin{cases}
10 = A \cdot 5^1 + B \cdot 2^1 \\
29 = A \cdot 5^2 + B \cdot 2^2 \\
\end{cases}
\]
Simplify them:
\[
\begin{cases}
10 = 5A + 2B \\
29 = 25A + 4B \\
\end{cases}
\]
5. **Solve the System of Equations:**
Multiply the first equation by 2:
\[
20 = 10A + 4B
\]
Subtract this from the second equation to eliminate \(B\):
\[
29 - 20 = 25A - 10A
\]
This simplifies to:
\[
9 = 15A \quad \Rightarrow \quad A = \](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F6e7678eb-8065-40b2-b3bf-4a03ebf783be%2Fc05d82e7-8a59-4161-87fa-b1a7439be1fa%2Feqaxj6l_processed.png&w=3840&q=75)
Transcribed Image Text:### Solving a Recurrence Relation
**Problem Statement:**
Solve the recurrence relation \(a_{n+1} = 7a_n - 10a_{n-1}\), for \( n \geq 2 \), given the initial conditions \(a_1 = 10\) and \(a_2 = 29\).
**Solution Approach:**
To solve this recurrence relation, we can use characteristic equations:
1. **Form the Characteristic Equation:**
\[
r^2 = 7r - 10
\]
Rearrange to get:
\[
r^2 - 7r + 10 = 0
\]
2. **Solve the Characteristic Equation:**
Factorize the quadratic equation:
\[
(r - 5)(r - 2) = 0
\]
Thus, the roots are:
\[
r_1 = 5, \quad r_2 = 2
\]
3. **General Solution:**
Using the roots, the general solution for the recurrence relation is:
\[
a_n = A \cdot 5^n + B \cdot 2^n
\]
4. **Find Constants \(A\) and \(B\):**
Use the initial conditions to form a system of equations:
\[
\begin{cases}
10 = A \cdot 5^1 + B \cdot 2^1 \\
29 = A \cdot 5^2 + B \cdot 2^2 \\
\end{cases}
\]
Simplify them:
\[
\begin{cases}
10 = 5A + 2B \\
29 = 25A + 4B \\
\end{cases}
\]
5. **Solve the System of Equations:**
Multiply the first equation by 2:
\[
20 = 10A + 4B
\]
Subtract this from the second equation to eliminate \(B\):
\[
29 - 20 = 25A - 10A
\]
This simplifies to:
\[
9 = 15A \quad \Rightarrow \quad A = \
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