Solve the recurrence relation 71 20 7 20 if n = 0 fn = if n = 1 - 5 fn-1+14 fn-2+3" if n > 2
Solve the recurrence relation 71 20 7 20 if n = 0 fn = if n = 1 - 5 fn-1+14 fn-2+3" if n > 2
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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This is a discrete math problem. Please explain clearly, no cursive writing.

Transcribed Image Text:## Solving the Recurrence Relation
To solve the recurrence relation, we are given the following conditions:
- \( f_n = \frac{71}{20} \) for \( n = 0 \)
- \( f_n = -\frac{7}{20} \) for \( n = 1 \)
- \( f_n = 5f_{n-1} + 14f_{n-2} + 3^n \) for \( n \geq 2 \)
### Explanation:
The relation is defined piecewise, with the first two values given explicitly and a recursive formula for subsequent terms:
- **Base Cases:**
- \( f_0 = \frac{71}{20} \)
- \( f_1 = -\frac{7}{20} \)
- **Recursive Case:**
- For \( n \geq 2 \), \( f_n \) is defined recursively in terms of the two preceding values, \( f_{n-1} \) and \( f_{n-2} \), plus a non-homogeneous part \( 3^n \).
This recurrence relation specifies a sequence where each term depends on the two preceding terms and an additional growing term \( 3^n \). Solving this usually involves finding the homogeneous solution to the characteristic equation associated with the linear part (\( 5f_{n-1} + 14f_{n-2} \)) and a particular solution for the non-homogeneous part.
Understanding and solving such a relation involves techniques that may include:
- Finding the characteristic equation.
- Solving for eigenvalues.
- Constructing the general solution with both homogeneous and particular solutions.
- Applying initial conditions to find the constants of integration.
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