1) Consider the conquer and divide relation f(n) = 2f (n / 4) +9 with f(1) = 3. a. Considering only arguments for f(n) when n = 4k, for some integer k, provide an explicit formula for f(n). b. What is f(256)? What is the big-O estimate for f(n)? C.

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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### Problem 1: Analyzing a Conquer and Divide Relation

Consider the conquer and divide relation \( f(n) = 2f(n / 4) + 9 \) with \( f(1) = 3 \).

#### a. Explicit Formula for \( f(n) \)

Considering only arguments for \( f(n) \) when \( n = 4^k \) for some integer \( k \), provide an explicit formula for \( f(n) \).

---

#### b. Evaluate \( f(256) \)

What is \( f(256) \)?

---

#### c. Big-O Estimate for \( f(n) \)

What is the big-O estimate for \( f(n) \)?

---

In explanation:
- For part **a**, you need to derive the closed form for the given recursive relation assuming \( n \) can be expressed as \( 4^k \).
- For part **b**, substitute \( n = 256 \) in your closed form expression (or solve the recursion iteratively).
- For part **c**, use the Master Theorem for divide-and-conquer recurrences to determine the asymptotic complexity of \( f(n) \).
Transcribed Image Text:### Problem 1: Analyzing a Conquer and Divide Relation Consider the conquer and divide relation \( f(n) = 2f(n / 4) + 9 \) with \( f(1) = 3 \). #### a. Explicit Formula for \( f(n) \) Considering only arguments for \( f(n) \) when \( n = 4^k \) for some integer \( k \), provide an explicit formula for \( f(n) \). --- #### b. Evaluate \( f(256) \) What is \( f(256) \)? --- #### c. Big-O Estimate for \( f(n) \) What is the big-O estimate for \( f(n) \)? --- In explanation: - For part **a**, you need to derive the closed form for the given recursive relation assuming \( n \) can be expressed as \( 4^k \). - For part **b**, substitute \( n = 256 \) in your closed form expression (or solve the recursion iteratively). - For part **c**, use the Master Theorem for divide-and-conquer recurrences to determine the asymptotic complexity of \( f(n) \).
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