Prove the following statements by divisibility. 1. If a/b and a/c, then a/ (bx + cy) where x, y € Z.

Advanced Engineering Mathematics
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Author:Erwin Kreyszig
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Prove the following statements by divisibility.
1. If a/b and a/c, then a/ (bx + cy) where x, y ɛ Z.
2. If a / b and b/a, then a = ±b.
5 is a multiple of 3, then 28n²
13n
5 is a multiple of 9 for some integer n.
3. Show that if 7n
4. Show that if 2n + 1 is divisible by 5, then 14n² + 19n + 6 is divisible by 25 for some integer n.
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Transcribed Image Text:Prove the following statements by divisibility. 1. If a/b and a/c, then a/ (bx + cy) where x, y ɛ Z. 2. If a / b and b/a, then a = ±b. 5 is a multiple of 3, then 28n² 13n 5 is a multiple of 9 for some integer n. 3. Show that if 7n 4. Show that if 2n + 1 is divisible by 5, then 14n² + 19n + 6 is divisible by 25 for some integer n. - -
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