10. If a € Z, then a³ = a (mod 3).
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter1: Fundamental Concepts Of Algebra
Section1.1: Real Numbers
Problem 36E
Related questions
Question
Prove the following statements
ANSWER #10 ONLY
![1. Suppose x € Z. Then x is even if and only if 3x +5 is odd.
2. Suppose x € Z. Then x is odd if and only if 3x + 6 is odd.
3. Given an integer a, then a³ + a² +a is even if and only if a is ever
4. Given an integer a, then a² + 4a +5 is odd if and only if a is even.
5. An integer a is odd if and only if a³ is odd.
6. Suppose x, y € R. Then x³+x²y = y² + xy if and only if y=x² or y=-x.
7. Suppose x, y € R. Then (x + y)² = x² + y² if and only if x = 0 or y = 0.
8. Suppose a,b € Z. Prove that a = b (mod 10) if and only if a = b (mod 2) and a = b
(mod 5).
9. Suppose a € Z. Prove that 14|a if and only if 7 | a and 2 | a.
10. If a € Z, then a³ = a (mod 3).](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fcd3ec7d8-9c0b-4838-b1ac-98e465a7f0e1%2F130af21b-728b-4bc6-87af-2049b11dbfa9%2Faowm9jd_processed.jpeg&w=3840&q=75)
Transcribed Image Text:1. Suppose x € Z. Then x is even if and only if 3x +5 is odd.
2. Suppose x € Z. Then x is odd if and only if 3x + 6 is odd.
3. Given an integer a, then a³ + a² +a is even if and only if a is ever
4. Given an integer a, then a² + 4a +5 is odd if and only if a is even.
5. An integer a is odd if and only if a³ is odd.
6. Suppose x, y € R. Then x³+x²y = y² + xy if and only if y=x² or y=-x.
7. Suppose x, y € R. Then (x + y)² = x² + y² if and only if x = 0 or y = 0.
8. Suppose a,b € Z. Prove that a = b (mod 10) if and only if a = b (mod 2) and a = b
(mod 5).
9. Suppose a € Z. Prove that 14|a if and only if 7 | a and 2 | a.
10. If a € Z, then a³ = a (mod 3).
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