X = 17 (mod 21) X= - ) 8 Cmod 25
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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This section covers a system of congruences, which is part of number theory in mathematics. We are given the following two congruences:
1. \( x \equiv 17 \pmod{21} \)
2. \( x \equiv -8 \pmod{25} \)
**Explanation:**
- The first congruence, \( x \equiv 17 \pmod{21} \), means that when \( x \) is divided by 21, the remainder is 17.
- The second congruence, \( x \equiv -8 \pmod{25} \), means that when \( x \) is divided by 25, the remainder is -8. Note that the remainder can also be expressed in positive terms as \( x \equiv 17 \pmod{25} \), since \( -8 \equiv 17 \pmod{25} \) (because \( 25 - 8 = 17 \)).
These congruences can be solved using various methods, such as the Chinese Remainder Theorem, to find a common solution for \( x \).
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