Prove that if x and y are integers and x2+y2 is even, then (x+y)(x-y) is even.

College Algebra (MindTap Course List)
12th Edition
ISBN:9781305652231
Author:R. David Gustafson, Jeff Hughes
Publisher:R. David Gustafson, Jeff Hughes
Chapter4: Polynomial And Rational Functions
Section4.5: Zeros Of Polynomial Functions
Problem 73E
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Prove that if x and y are integers and x2+y2 is even, then (x+y)(x-y) is even.

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