Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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### Set Theory and Elements

**List the elements of the following sets:**

a) **\( M = \text{The letters in the word "mathematics"} \)**
- **Note:** There are not 11 elements in the set.
- **Solution:** \( M = \{ m, a, t, h, e, i, c, s \} \)

b) **\( M - B \) when \( M \) is defined above and \( B = \{ a, e, i, o, u \} \)**
- **Solution:** \( M - B = \{ m, t, h, c, s \} \)

c) **\( A \cup B \) with \( B \) defined above and \( A = \{ s, e, t \} \)**
- **Solution:** \( A \cup B = \{ s, e, t, a, i, o, u \} \)

d) **\( (A - B) \) for \( A \) and \( B \) defined above with**
   - **The letters in the word "Sarina"**
   - **Solution:** \( A - B = \{ s, t \} \) and "Sarina" leads to \\{ s, a, r, i, n \}.

e) **\( A^t \) when \( x = \{ a, b, c, d, \ldots, m \} \)**
- **Interpretation:** Elements of \( x \) are not defined in detail.

f) **\( x \in \text{Reals} \), solve \( x^2 + 6x + 8 = 0 \)**
- **Solution:** Solve the quadratic equation \( x^2 + 6x + 8 = 0 \) using the quadratic formula or factoring:
  \[
  (x + 2)(x + 4) = 0
  \]
  Hence, \( x = -2 \) or \( x = -4 \).
Transcribed Image Text:### Set Theory and Elements **List the elements of the following sets:** a) **\( M = \text{The letters in the word "mathematics"} \)** - **Note:** There are not 11 elements in the set. - **Solution:** \( M = \{ m, a, t, h, e, i, c, s \} \) b) **\( M - B \) when \( M \) is defined above and \( B = \{ a, e, i, o, u \} \)** - **Solution:** \( M - B = \{ m, t, h, c, s \} \) c) **\( A \cup B \) with \( B \) defined above and \( A = \{ s, e, t \} \)** - **Solution:** \( A \cup B = \{ s, e, t, a, i, o, u \} \) d) **\( (A - B) \) for \( A \) and \( B \) defined above with** - **The letters in the word "Sarina"** - **Solution:** \( A - B = \{ s, t \} \) and "Sarina" leads to \\{ s, a, r, i, n \}. e) **\( A^t \) when \( x = \{ a, b, c, d, \ldots, m \} \)** - **Interpretation:** Elements of \( x \) are not defined in detail. f) **\( x \in \text{Reals} \), solve \( x^2 + 6x + 8 = 0 \)** - **Solution:** Solve the quadratic equation \( x^2 + 6x + 8 = 0 \) using the quadratic formula or factoring: \[ (x + 2)(x + 4) = 0 \] Hence, \( x = -2 \) or \( x = -4 \).
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