4. Consider the functions f, g, h, k: N→ N given by f(n) = 2 · n+1, g(n) = n² +1, h(n) = 2 · n² +3, and k(n) = 2 (2.n. (n+1) + 1). (a) Show that fog = h. (b) Show that go f = k. (c) Is h = k? (d) Is the composition of functions a commutative operation?

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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**Problem 4: Composition of Functions**

Consider the functions \( f, g, h, k: \mathbb{N} \to \mathbb{N} \) given by:

- \( f(n) = 2n + 1 \)
- \( g(n) = n^2 + 1 \)
- \( h(n) = 2n^2 + 3 \)
- \( k(n) = 2 \cdot (2 \cdot n \cdot (n + 1) + 1) \)

**Tasks:**

(a) Show that \( f \circ g = h \).

(b) Show that \( g \circ f = k \).

(c) Is \( h = k \)?

(d) Determine if the composition of functions is a commutative operation.
Transcribed Image Text:**Problem 4: Composition of Functions** Consider the functions \( f, g, h, k: \mathbb{N} \to \mathbb{N} \) given by: - \( f(n) = 2n + 1 \) - \( g(n) = n^2 + 1 \) - \( h(n) = 2n^2 + 3 \) - \( k(n) = 2 \cdot (2 \cdot n \cdot (n + 1) + 1) \) **Tasks:** (a) Show that \( f \circ g = h \). (b) Show that \( g \circ f = k \). (c) Is \( h = k \)? (d) Determine if the composition of functions is a commutative operation.
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