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
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ISBN:9780470458365
Author:Erwin Kreyszig
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This is a discrete math problem. Please explain clearly, no cursive writing. 

## 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.
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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