Using the direct proof method, prove that for every integer a, if (a-2) is divisible by 3, then (a2-1) is also divisible by 3

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section10.2: Arithmetic Sequences
Problem 56E
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Using the direct proof method, prove that for every integer a, if (a-2) is divisible by 3, then (a2-1) is also divisible by 3

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