For all integers n, if 6 | n, then 9 | ((n^2) + 21n/2)

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter1: Fundamental Concepts Of Algebra
Section1.1: Real Numbers
Problem 10E
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For the statement shown below, write a formal mathematical proof.
Be sure to start your proof with two lines that lay out what you know and what you are trying to show.
(a)  For all integers n, if 6 | n, then 9 | ((n^2) + 21n/2)

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