The image presents two recurrence relations. The first recurrence relation is $a_1 = 1$, $a_{n+1} = 4a_n + 9$. The second recurrence relation is $a_1 = -1$, $a_2 = 1$, $a_{n+2} = a_{n+1} + 6a_n$.

Discrete MathematicsRecurrence RelationsSequences and Series
2025/4/3

1. Problem Description

The image presents two recurrence relations.
The first recurrence relation is a1=1a_1 = 1, an+1=4an+9a_{n+1} = 4a_n + 9.
The second recurrence relation is a1=1a_1 = -1, a2=1a_2 = 1, an+2=an+1+6ana_{n+2} = a_{n+1} + 6a_n.

2. Solution Steps

The problem does not state to solve for a specific ana_n. Therefore, I will provide the recurrence relations as is.
First recurrence relation:
a1=1a_1 = 1
an+1=4an+9a_{n+1} = 4a_n + 9
Second recurrence relation:
a1=1a_1 = -1
a2=1a_2 = 1
an+2=an+1+6ana_{n+2} = a_{n+1} + 6a_n

3. Final Answer

First recurrence relation:
a1=1a_1 = 1
an+1=4an+9a_{n+1} = 4a_n + 9
Second recurrence relation:
a1=1a_1 = -1
a2=1a_2 = 1
an+2=an+1+6ana_{n+2} = a_{n+1} + 6a_n

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